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Water treatment brands, side by side

How each brand sells and what it offers, in its own words. We don’t rate or rank brands; we show what’s public.

Short answer

Of the 13 water treatment brands we cover, 9 sell online and ship systems for you or a plumber to install. The other 4, Culligan, EcoWater, Kinetico and RainSoft, sell through local dealers who test your water, quote a price and install. 8 have products in NSF’s or WQA’s public certification listings, where you can check a filter’s claims yourself.

Brand websites and public NSF/WQA listings, read November 2026 · Sources and method

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