Drinking Water
Reverse osmosis and under-sink filters for the kitchen tap.
What to compare
- Production (GPD)
- Gallons a day the membrane makes; tankless units need higher ratings.
- Tank or tankless
- Tankless saves space under the sink; tank units store a reserve.
- Pure-to-drain ratio
- How much water goes to the drain for each gallon made.
- Certified claims
- NSF/ANSI 58 for reverse osmosis, with the contaminants listed for that model.
- Power and faucet
- Whether it needs an outlet under the sink and a hole for its own faucet.
Need the numbers for your water first? How to read a water test