Dedicated filtration for your kitchen drinking water.
The most comprehensive under-sink filter we've tested. Clearly Filtered's Affinity Filtration removes fluoride, lead, PFAS, pharmaceuticals, and 362 other contaminants—all without RO waste water. Includes dedicated faucet.
Pros: Unmatched contaminant removal, retains minerals, no waste water.
Cons: Higher filter cost ($150/year), slower flow rate.
Check Price →Best-selling RO system for good reason. Five stages of filtration including RO membrane removes 99% of contaminants. Excellent value with filters costing about $50/year. Includes tank and faucet.
Pros: Excellent filtration, affordable long-term, reliable brand.
Cons: Wastes 3-4 gallons per gallon filtered, removes minerals.
Check Price →Simple single-stage carbon filter that connects directly to your cold water line. No separate faucet needed—filters your existing tap. Great for renters or basic chlorine/taste improvement.
Pros: Easy DIY install, affordable, high capacity.
Cons: Basic filtration only, doesn't remove fluoride or heavy metals.
Check Price →| Factor | Under Sink | Countertop | Pitcher |
|---|---|---|---|
| Filtration quality | Excellent | Good | Basic-Good |
| Convenience | Best (on-demand) | Good | Refill needed |
| Installation | Moderate DIY | None | None |
| Cost | $80-600 | $50-300 | $25-80 |
Can I install an under sink filter myself?
Most under-sink filters are DIY-friendly with basic tools. You'll need to connect to your cold water line and may need to drill a hole for a dedicated faucet. Budget 1-2 hours.