Tankless Reverse Osmosis Systems
Premium under-sink RO filtration — no storage tank, no wasted space, no compromises. Up to 800 gallons of pure water per day at a fraction of the footprint.
- 400% more efficient than standard RO — 2:1 pure to waste ratio means less water wasted
- No storage tank — fits in 25–50% of the cabinet space of a traditional RO system
- Tool-free twist-lock filters — swap in minutes, no plumber or tools required
- Built-in booster pump — works with low water pressure and well water homes
HSA / FSA eligible • Free shipping to Continental US • Klarna financing available
600 GPD — Best Value
Efficiency Series Tankless Reverse Osmosis — 600 GPD
The compact entry into tankless filtration. Ideal for 1–3 person households who want premium efficiency RO without the bulk of a storage tank.
- 600 gallons per day — ideal for households of 1–4 people
- 400% more efficient than standard RO — 2:1 pure to waste ratio
- 25–50% of the cabinet space of a traditional RO system
- Tool-free twist-lock filters — swap in minutes, no plumber needed
- Built-in booster pump — performs even with low water pressure
HSA / FSA eligible • Klarna financing available
“The compact size is unbelievable. I couldn't fit a traditional RO system under my sink, but this fits perfectly with room to spare. Water quality is excellent and filter changes take about 2 minutes.”
800 GPD — Most Powerful
Efficiency Series Tankless Reverse Osmosis — 800 GPD
Featuring an upgraded Stage 3 800 GPD membrane for maximum output. Built for larger households, high-demand kitchens, and anyone who wants the fastest tankless RO system available.
- 800 gallons per day — 33% more output, ideal for 4+ person households
- New Stage 3 upgraded membrane — faster, cleaner filtration
- 400% more efficient than standard RO — 2:1 pure to waste ratio
- 25–50% of the cabinet space of a traditional RO system
- Tool-free twist-lock filters — swap in minutes, no plumber needed
HSA / FSA eligible • Klarna financing available
“We have a family of 5 and this system keeps up with everything — morning coffee rush, cooking, filling water bottles. The upgrade to 800 GPD was absolutely worth it.”
Which Filter Is Right For You?
Four Configurations. One Right Answer for Your Water.
Every Efficiency Series system uses the same high-output RO core. The filter configuration you choose depends on your water source and whether you want minerals added back.
Classic RO
Pure reverse osmosis filtration. Removes 1,000s of contaminants including lead, PFAS, fluoride, chlorine, arsenic, and heavy metals.
Best for:
- City or municipal water
- Standard households
- Those who prefer natural TDS levels
+ Alkaline Filter
Everything in Classic RO, plus an alkaline remineralization stage that adds beneficial minerals back and raises pH for a crisp, clean taste.
Best for:
- City or municipal water
- Those who want minerals added back
- Alkaline water preference
+ UV Filter
Everything in Classic RO, plus a UV-C stage that uses ultraviolet treatment — recommended for well water and untreated sources.
Best for:
- Well water or untreated sources
- Added protection for untreated water
- Rural homes without municipal treatment
+ Alkaline & UV
The full package — RO filtration, UV-C Treatment, AND alkaline remineralization. Comprehensive coverage with the best-tasting result.
Best for:
- Well water + mineral preference
- Most comprehensive protection
- Anyone who wants the best of everything
Not sure? Our US-based team can help you choose. Call 1.888.621.0460 or start a live chat.
Space Saving
Fits Where Traditional RO Systems Can't
Most under-sink RO systems take up the entire cabinet with a pressurized storage tank and multiple filter housings. Tankless changes that equation completely.
If you've been told your under-sink cabinet is too small for a reverse osmosis system — it probably fits a tankless one. The compact cylindrical design of the 600 GPD and low-profile rectangular design of the 800 GPD are built specifically for kitchens where traditional RO systems don't fit.
Approximate under-sink footprint comparison
Classic RO System
~100% cabinet usage
Tankless 600 GPD
~30% cabinet usage
Tankless 800 GPD
~45% cabinet usage
Flexible Payment Options
Own the Best RO System for Less Than Bottled Water
Split your purchase into 4 interest-free payments with Klarna, or pay with your HSA or FSA card using pre-tax dollars. Pure water shouldn't be a budget decision.
Shop Now, Pay Over Time →The real cost of clean water
Annual savings vs. bottled water
$193
per person. Doubles with every additional household member.
Side-by-Side Comparison
Tankless vs. Classic RO — What's the Difference?
Both systems produce the same clean, filtered water. The difference is how they get there — and how much space they take up doing it.
| Feature | Best Efficiency Tankless RO Efficiency Series | Classic RO Platinum Series |
|---|---|---|
| Storage Tank Required | No tank needed | Pressurized tank required |
| Under-Sink Space | 25–50% of standard RO footprint | Full cabinet footprint + tank |
| Flow Rate | Up to 800 GPD | 100 GPD |
| Water Efficiency | 2:1 pure to waste ratio | 3:1 to 5:1 waste ratio |
| Filter Changes | Tool-free twist-lock — 2 min. | Standard filter housings |
| Filtration Stages | 4 stages | 5–6 stages |
| Installation | Under-sink, standard setup | Under-sink, standard setup |
| Best For | Space-saving, high efficiency, large households, high output | Budget-conscious buyers, standard households |
| Starting Price | $284.95 | $169.95 → |
Choose Tankless if…
- You have limited under-sink cabinet space
- You want less water waste and higher efficiency
- Your household demands higher daily water output
- You want faster, tool-free filter maintenance
Choose Classic RO if…
- Budget is your primary consideration
- You have plenty of under-sink cabinet space
- You prefer more filtration stages
- A standard setup works fine for your household
Is Tankless Right For You?
Tankless RO Is Built for These Households
If any of these sound like you, a tankless system will serve you better than a traditional RO — and you'll know it the moment you open your sink cabinet.
Limited Under-Sink Space
If your sink cabinet is already packed — pipes, cleaning supplies, and no room for a bulky pressurized tank — a tankless system fits in 25–50% of the space a traditional RO system requires.
Eco-Conscious Households
Standard RO systems waste 3–5 gallons of water for every gallon filtered. The tankless Efficiency Series uses a 2:1 ratio — producing twice as much clean water with the same amount wasted.
Large or High-Demand Households
Traditional RO systems top out at 100 GPD. If you have 4 or more people, cook frequently, or go through filtered water fast, the 600 or 800 GPD output keeps up without running dry.
Low-Maintenance Buyers
Tool-free twist-lock filters swap in under two minutes with no wrenches, no mess, and no plumber. If you want an RO system that stays out of your way until it's time for a filter change, this is it.
Homes With Low Water Pressure
Most RO systems need at least 40 PSI to run properly. The Efficiency Series includes a built-in booster pump that maintains optimal pressure — so it performs reliably even on well water or low-pressure lines.
Ready to Upgrade From Classic RO
If you already have an under-sink RO system and want more output, less wasted water, and easier maintenance, the Efficiency Series is a direct upgrade — same installation footprint, dramatically better performance.
No Tank. No Mystery.
How Tankless RO Filtration Works
Removing the storage tank doesn't mean removing performance. It means faster water, a smaller footprint, and a smarter filtration process.
Water Enters the System
Cold water from your supply line feeds directly into the Efficiency Series unit — a compact housing mounted under your sink. The built-in booster pump brings it up to optimal filtration pressure, even if your home runs below 40 PSI.
4-Stage Filtration Removes Contaminants
Water passes through four filtration stages: a sediment/carbon block pre-filter removes particles and chlorine, the high-output RO membrane eliminates dissolved solids, heavy metals, and PFOA's, and a post-carbon stage polishes the taste. Add an alkaline stage to remineralize purified water, or a UV stage to help treat water — recommended for well water and untreated sources.
Pure Water Flows Directly to Your Faucet
Because there's no storage tank, filtered water flows on demand at up to 600–800 gallons per day — directly to your dedicated faucet. No waiting for a tank to refill, no stale water sitting in a pressurized bladder. Just turn the tap and it's there.
How is this different from a traditional RO system?
A classic RO system filters water slowly — usually 50–100 GPD — into a pressurized storage tank, where it waits until you open the faucet. Tankless RO removes the tank entirely. Water is filtered on demand at much higher flow rates, producing fresher water faster while using half the cabinet space and wasting far less water in the process.
What Customers Are Saying
136 Verified Reviews. Here's What Customers Are Actually Saying.
“I have a tiny kitchen with almost no cabinet space under the sink. I had given up on getting an RO system until I found this one. It fits perfectly with room to spare. The water quality is incredible — our whole family noticed the difference immediately.”
“Filter changes on my old RO system were a pain — tools, dripping water, wrestling with housings. These twist-lock filters took me under two minutes the first time I changed them. No tools, no mess. This alone was worth the upgrade.”
“We had our water tested before and after. The TDS went from 340 down to 8. The taste is completely different — no more buying bottled water. We've had this system for six months and it's been flawless.”
“Family of 5 here — we went through our old RO tank constantly. It would run out and we'd have to wait for it to refill. The 800 GPD never runs out. We fill water bottles, cook, make coffee, and the faucet just flows. Should have done this years ago.”
“Upgraded from a 5-stage system I'd had for years. The difference is night and day — not just in water quality but in how much space I got back under the sink. Install was straightforward and NU Aqua's support team answered my questions within the hour.”
“We're on well water with low pressure and I was worried this wouldn't work for us. The booster pump handles it perfectly — consistent flow every time. Water quality is the best we've ever had from our tap. Zero issues after four months.”
Keep Exploring
More From NU Aqua
Best Seller
Replacement Filters
Genuine NU Aqua filters for your Efficiency Series system. Quick-swap twist-lock design. Ships every 6 months with a subscription.
All Reverse Osmosis Systems
Browse our full range of under-sink, countertop, and specialty RO systems. Compare options and find the right fit for your home.
Countertop RO Systems
Zero installation required. Plug in, dispense pure water. Perfect for renters, small kitchens, and anyone who doesn't want to touch their plumbing.
Whole House Water Systems
Filtered water from every tap, shower, and appliance in your home. The next step up for households who want comprehensive water treatment.
Buyer's Guide
The Complete Guide to Tankless Reverse Osmosis Systems
Everything you need to know before buying — including the questions most brands won't answer honestly.
What Is a Tankless Reverse Osmosis System?
A tankless reverse osmosis system is an under-sink water filtration system that produces purified water on demand — without storing it in a pressurized tank. Traditional RO systems filter water slowly (typically 50–100 gallons per day) into a bladder tank that sits under your sink, then dispenses from that stored supply when you open the faucet. Tankless systems remove the tank entirely.
Instead of slow tank-filling, tankless RO uses a high-capacity membrane and a built-in booster pump to produce water at dramatically higher flow rates — typically 400–800 gallons per day — delivering it directly to a dedicated faucet the moment you turn it on. The result is fresher water, a smaller footprint, and significantly less water wasted in the filtration process.
Tankless RO systems are sometimes called "tank-free RO," "direct-flow RO," or "instant RO" systems. They all refer to the same technology: high-flow RO filtration with no pressurized storage tank.
Tankless RO: Honest Pros and Cons
Most brands only tell you the advantages. Understanding the trade-offs helps you buy the right system — not just the most expensive one.
Advantages
- No storage tank. Fits in 25–50% of the cabinet space of a traditional RO system. Works in kitchens where classic RO physically can't fit.
- High output. 400–800 GPD vs. 50–100 GPD for traditional systems. Never runs dry regardless of household demand.
- Better efficiency. 2:1 pure to waste ratio vs. 3:1 to 5:1 for standard RO — significantly less water wasted per gallon produced.
- Fresher water. No storage tank means no water sitting in a pressurized bladder for hours or days. Every glass is filtered on demand.
- Easier maintenance. Tool-free twist-lock filters replace in under 2 minutes without tools or plumber.
- Higher flow rate at the faucet. 0.42–0.56 GPM (gallons per minute) vs. 0.1–0.2 GPM from a tank-based system.
Disadvantages — and how to think about them
- Higher upfront cost. Typically 50–100% more expensive than a classic RO system. The 600 GPD starts at $284.95 vs. $169.95 for the Platinum Series classic RO. For most households, the space savings and efficiency gains justify the premium — but budget is a real factor.
- Requires electricity. The booster pump needs a standard 110V outlet, which most under-sink cabinets already have. If yours doesn't, you'll need an outlet installed before setup.
- Won't work during a power outage. Without electricity, the booster pump won't run and the system won't produce water. This affects tankless systems specifically — classic RO systems with pressurized tanks can dispense stored water even without power.
- Initial flow lag. There may be a very brief (1–2 second) delay when you first turn on the faucet as the system pressurizes. This is minor and not noticeable in day-to-day use.
Bottom line on the disadvantages: The electricity requirement is minor — most under-sink cabinets have an outlet nearby. The power outage limitation is real but rarely a deciding factor for households not in frequent outage zones. If budget is your primary constraint, the Classic Platinum Series at $169.95 is an excellent system. If space, efficiency, or output matters, tankless wins decisively.
How Much Flow Rate Do You Actually Need? (GPD and GPM Explained)
Reverse osmosis systems are rated in two ways: GPD (gallons per day) — total daily output capacity — and GPM (gallons per minute) — the actual flow rate at your faucet. Most manufacturers advertise GPD. Most plumbing specs use GPM. Here's how they relate and what actually matters for your household.
| System | GPD Rating | Est. GPM at Faucet | Household Size | Best For |
|---|---|---|---|---|
| Classic RO (Platinum Series) | 100 GPD | ~0.07–0.14 GPM | 1–4 people | Budget buyers with adequate cabinet space |
| Efficiency Series 600 GPD | 600 GPD | ~0.42 GPM | 1–4 people | Space-constrained, efficiency-focused households |
| Efficiency Series 800 GPD | 800 GPD | ~0.56 GPM | 4+ people | Large households, high-demand kitchens, heavy cookers |
For reference: filling a 16 oz glass takes about 3 seconds at 0.42 GPM and 2.5 seconds at 0.56 GPM. Both tankless options feel instant at the faucet. The 100 GPD classic system takes significantly longer to fill a glass and can run the tank low during peak use periods.
The average person drinks and cooks with 1–2 gallons of filtered water per day. A family of 4 uses roughly 6–8 gallons. Both tankless systems produce 75–100x more than any household will realistically consume in a day — so neither will ever run dry.
City Water vs. Well Water: Choosing the Right Filter Configuration
Your water source determines which of the four filter configurations is right for you. City or municipal water is pre-treated with chlorine and chloramines before it reaches your home — effective against microbiological contaminants but leaving chemical residue that Classic RO removes completely. Well water is a different situation: untreated groundwater can contain microbiological contaminants, nitrates, agricultural runoff, and heavy metals that benefit from UV-C treatment as an additional protective layer alongside RO filtration.
On city or municipal water:
- Classic RO — removes lead, PFAS, fluoride, chlorine, arsenic, and thousands of dissolved contaminants. Most popular choice.
- + Alkaline — Classic RO plus a remineralization stage that adds calcium, magnesium, and potassium back, raising pH. Best for those who prefer the taste of mineral water or are concerned about mineral intake from drinking water.
UV optional for city water — municipal treatment already handles microbiological concerns in most areas.
On well or untreated water:
- + UV Filter — Classic RO plus a UV-C stage that provides an important additional layer of microbiological protection — recommended for well water and untreated sources.
- + Alkaline & UV — The complete configuration: UV-C microbiological protection plus alkaline remineralization. Best for well water with taste preferences or mineral concerns.
UV recommended for well water — the RO membrane is highly effective against protozoa like Cryptosporidium and Giardia, while the UV stage provides an additional layer of microbiological protection.
What Does a Tankless RO System Remove — and What Doesn't It Remove?
Reverse osmosis is the most comprehensive home water filtration method available, capable of reducing contaminants to levels that standard pitcher filters, faucet filters, and carbon filters cannot approach. The NU Aqua Efficiency Series filters to 0.0001 microns — far smaller than any particle, pathogen, or dissolved ion.
Effectively removed (95–99% reduction):
- Lead, mercury, arsenic, chromium
- Fluoride, chlorine, chloramines
- PFAS / PFOA (forever chemicals)
- Nitrates, nitrites, phosphates
- Sodium, calcium, magnesium (dissolved solids)
- Cryptosporidium, Giardia (protozoa)
- Radium, barium, sulfate
- Pesticides and herbicides
- Microbiological contaminants (UV stage adds an additional layer of protection)
Not reliably removed by RO alone:
- Some dissolved gases (chlorine gas, hydrogen sulfide) — addressed by carbon pre-filter
- Microbiological contaminants — RO filtration is highly effective; the UV stage provides an additional protective layer for complete confidence
- Certain volatile organic compounds (VOCs) — reduced but not eliminated by RO alone
- Dissolved oxygen — RO water is still oxygenated normally
The carbon pre-filter and post-carbon stages in the Efficiency Series address many of the gaps in the RO membrane alone.
Is RO Water Safe? Addressing the Kidney and Mineral Concerns
A common question: if RO removes dissolved minerals like calcium and magnesium, does that make the water harmful? The short answer is no. Scientific consensus, including guidance from the World Health Organization, confirms that pure RO water is safe for regular consumption. The minerals your body actually needs come overwhelmingly from food — not drinking water.
That said, some people prefer mineralized water for taste reasons, and there is a reasonable argument that drinking water can contribute a small supplement of beneficial minerals over time. If either of these applies to you, the Alkaline filter option adds a remineralization stage that replenishes calcium, magnesium, and potassium after filtration, raising the pH and restoring a natural mineral profile similar to spring water.
90% of bottled water on the market is processed using reverse osmosis. If RO water were harmful, the bottled water industry would not exist at its current scale. The Alkaline filter option gives you the same pure RO base with a mineral profile you'd recognize from premium spring water.
What Can You Use Tankless RO Water For?
Beyond drinking water, high-purity RO water has a range of household applications that many buyers don't initially consider.
Drinking & Cooking
The primary use. Pure RO water improves the taste of coffee, tea, soups, and anything else where tap water flavor would be noticeable.
CPAP Machines
CPAP humidifiers require purified water to prevent mineral buildup. RO water is an excellent and significantly cheaper alternative to distilled water — and at 600–800 GPD, you'll never run out.
Baby Formula
Low-sodium, contaminant-free water is recommended for infant formula preparation. RO water meets these standards and eliminates the need to buy bottled water for formula.
Ice Makers & Refrigerators
RO water produces crystal-clear, odorless ice. Many households plumb their tankless RO into the refrigerator ice line for the best-tasting ice without replacing refrigerator filters.
Freshwater Aquariums
RO water gives aquarium keepers complete control over water chemistry. Unlike the RODI systems used in reef tanks, standard RO water remineralized to target parameters works well for freshwater planted tanks and most tropical fish.
Plants & Hydroponics
Sensitive plants, seedlings, and hydroponic setups benefit from the near-zero TDS of RO water, allowing precise control over nutrient solutions without interference from tap water minerals.
Understanding Efficiency Ratios — Why 2:1 Matters
Every reverse osmosis system produces wastewater as part of the filtration process. The efficiency ratio describes how much clean water you get relative to what's wasted. A 2:1 ratio means 2 gallons of clean water produced for every 1 gallon wasted. A 5:1 ratio — common in budget RO systems — means 5 gallons wasted for every clean gallon.
On city water at typical household usage, the difference between a 2:1 and 5:1 system adds up to roughly $30–60 per year in additional water costs. For households on well water (often metered or subject to pumping costs) or for environmentally conscious buyers, this difference matters significantly over the system's lifespan. The Efficiency Series maintains a 2:1 ratio across both the 600 GPD and 800 GPD — one of the best ratios available at this price point.
pure-to-waste ratio
system average
standard RO
Installation: What to Expect
The Efficiency Series installs under your kitchen sink in approximately 1–2 hours using basic tools — most homeowners complete it without a plumber. The process connects to two existing points: your cold water supply line (via a feed water adapter) and your sink drain (via a drain saddle). A separate faucet mounts through your countertop or sink through a pre-drilled hole or knockout.
One requirement worth noting: the system needs a standard 110V electrical outlet for the booster pump. Most under-sink cabinets already have one — if yours doesn't, have an electrician add a GFCI outlet before installation. The pump draws very little power (similar to a phone charger) and only runs during active filtration.
Connect to cold water line using the included feed water adapter — no permanent modification to your existing faucet
Mount the system under the sink — the compact design means it fits even in small cabinets
Install the faucet through a hole in your countertop or sink — most sinks have a pre-drilled knockout for this
Connect to drain using the drain saddle on the P-trap under your sink — handles wastewater automatically
Plug in and flush — run 2–3 gallons through the system before drinking to flush the new filters
Ongoing filter maintenance: Twist-lock filters should be replaced every 6–12 months depending on water quality and usage. The easiest way to stay on schedule is our Filter Club — the correct replacement filters for your exact configuration, delivered automatically every 6 months at a discount. Prefer to reorder manually? Shop replacement filters anytime.
What to Look For in a Quality Tankless RO System
The tankless RO category has grown rapidly and quality varies significantly between brands. Here's what actually separates a well-built system from one that looks the same but underperforms.
Integrated booster pump
RO membranes require a minimum of 40 PSI. A system without a built-in booster pump relies entirely on your home's incoming water pressure — which may be insufficient, especially on well water or older municipal systems. Always verify the booster pump is included, not sold separately.
Tool-free filter replacement
Filter changes are a recurring task — typically every 6–12 months. Systems that require tools, plumbers, or significant disassembly become maintenance burdens that lead to filters being changed late or skipped entirely. Twist-lock or push-fit designs eliminate this friction.
Quality fittings and housing
Cheap push-connect fittings and thin filter housings are the most common cause of leaks and underperformance in budget RO systems. Look for systems with documented quality standards on components — not just the membranes.
Manufacturer support, not a reseller
Many RO systems sold online are private-labeled products resold by companies with no manufacturing capability. When filters need replacing a year later or a component fails, resellers often have no parts available. NU Aqua manufactures its own systems — every component is available directly, and support comes from people who built the product.
Warranty length as a quality signal
A manufacturer's willingness to warranty their product for 3 years signals genuine confidence in its construction. The industry average for RO systems is 1 year. The NU Aqua Efficiency Series carries a 3-year warranty — the longest standard warranty in its category — plus a 120-day money-back guarantee if the system doesn't meet your expectations.
Ready to Choose Your System?
For most households on city water: the 600 GPD with Classic RO or Alkaline is the right call — excellent output, minimal footprint, and straightforward maintenance. For well water, families of 4+, or anyone who wants maximum output and comprehensive protection: the 800 GPD with UV or Alkaline & UV is the answer. If cabinet space isn't a constraint and budget is the priority, our classic reverse osmosis systems start at $169.95. Still unsure? Call our US-based team at 1.888.621.0460.
Frequently Asked Questions
Tankless RO — Common Questions Answered
Everything you need to know before you buy.
What is a tankless reverse osmosis system and how does it differ from a standard RO?
A tankless reverse osmosis system filters water on demand without using a pressurized storage tank. Traditional RO systems filter water slowly (50–100 GPD) into a tank that holds filtered water until you need it. Tankless systems remove the tank entirely and filter at much higher flow rates — up to 600 or 800 gallons per day — delivering filtered water directly to your faucet the moment you turn it on. The result is fresher water, less cabinet space used, and no waiting for a tank to refill.
Is a tankless RO worth the extra cost over a classic system?
It depends on your priorities. If cabinet space, water efficiency, or high daily output matters to you, the tankless system is worth it. You get 6–8x the flow rate of a classic RO, half the water waste, and a system that fits in 25–50% of the space. If your primary concern is budget and you have plenty of cabinet space, the Platinum Series Classic RO at $169.95 is an excellent system. The tankless upgrade pays off most for larger households, space-conscious buyers, and anyone who's frustrated by waiting for a tank to refill.
What is the difference between the 600 GPD and 800 GPD systems?
Both systems use the same tankless direct-flow design, offer the same four filter configurations, and deliver the same filtration quality. The key differences are output and design. The 600 GPD has a compact cylindrical drum shape and produces up to 600 gallons of filtered water per day — ideal for households of 1–4 people. The 800 GPD features a new upgraded Stage 3 membrane in a rectangular form factor and produces up to 800 gallons per day, making it a better fit for households of 4 or more people or high-demand use. The 800 GPD starts at $439.95, while the 600 GPD starts at $284.95.
How often do I need to change the filters?
Filter replacement frequency depends on your water quality and usage, but most households change filters every 6–12 months. The RO membrane typically lasts 1–2 years. The good news is that the Efficiency Series uses tool-free twist-lock filters that swap in under two minutes — no wrenches, no plumber, no mess. If you opt for the System + Filter Subscription, replacement filters ship automatically every 6 months at a 15% discount so you never have to think about it.
How difficult is it to install a tankless RO system?
Installation is similar to a standard under-sink RO system and most homeowners complete it without a plumber. The system connects to your cold water supply line and drain using the included feed water adapter and drain saddle. A separate faucet is installed through a hole in your countertop or sink. The process typically takes 1–2 hours and requires only basic tools. A full installation manual is included, and our US-based support team is available by phone or live chat if you have any questions during the process.
What water pressure does the tankless system require?
Most RO systems require a minimum of 40 PSI to operate efficiently. The Efficiency Series includes a built-in booster pump that brings your water up to optimal pressure regardless of your incoming line pressure. This means it works reliably even on well water systems, rural lines, or homes with low municipal pressure that would cause other RO systems to perform poorly or stop working entirely.
Does the tankless RO system work with well water?
Yes. The Efficiency Series works with well water, and we recommend the UV Filter or Alkaline & UV configuration for well water applications. The UV stage provides supplemental ultraviolet treatment that is a critical extra layer of protection for untreated well water. The built-in booster pump also handles the lower pressure common in well systems. If you have any specific water quality concerns, our support team can recommend the right configuration for your situation.
What contaminants does the tankless RO system remove?
The Efficiency Series removes the vast majority of dissolved contaminants including lead, mercury, arsenic, fluoride, chlorine, chloramines, nitrates, sodium, copper, chromium, radium, sulfate, and PFOA/PFAS compounds. The UV stage provides supplemental ultraviolet treatment that is a critical extra layer of protection for untreated well water. The RO membrane filters particles down to 0.0001 microns. Independent lab testing consistently shows TDS reductions of 95–99% from pre-filter to post-filter output.
Still have a question?
