About Filter Tested

Last updated August 2026

Filter Tested is an independent review site for water filters, water softeners, and reverse-osmosis systems. We help you cut through marketing claims and pick the right system for your water and your budget.

What we cover

Whole-house filters, under-sink and countertop RO systems, faucet and shower filters, gravity systems, pitcher filters, and salt-based and salt-free water softeners — plus buying guides organized by contaminant (lead, fluoride, arsenic, PFAS, hardness) and water source (city or well).

How we evaluate

We assess systems on contaminant reduction (against NSF/ANSI standards where certified), flow rate, filter life and replacement cost, installation, and long-term value — and we say plainly who a product is right for and who should skip it. See how we test for the full methodology.

We use affiliate links and may earn a commission at no extra cost to you. Our picks are always editorial — see our affiliate disclosure.