Countertop
Undersink
Whole House
Shower
Cost Range
$20-100
$50-500
$400-$5000
$20-$100
Installation Difficulty
Easy, DIY
Moderate, may need pro
Hard, usually pro required
Easy, DIY
Coverage
Drinking water only
Drinking water only
All water in home
Shower water only
Maintenance Requirements
Frequent filter changes, low cost
Periodic filter changes, moderate cost
Infrequent but costly replacements
Regular filter changes, low cost