Reverse-osmosis purity.
Pitcher simplicity.
NSF/ANSI 401 certified. Removes lead, PFAS, microplastics, and chlorine — while keeping the magnesium and calcium your body wants. Fits in your fridge. No plumbing.
See the pitcher →Three things most pitchers miss.
Independent lab testing against NSF/ANSI 53 and 401 protocols. Numbers below are from sample WT-2026-0314-A.
From corroded service lines and pre-1986 solder. Tested per NSF/ANSI 53.
PFOA and PFOS reduced below detection limits. NSF/ANSI 401 + P473.
Carbon block filtration retains particles down to 0.5 microns.
Between a pitcher and a plumber.
Most pitchers improve taste. Reverse-osmosis systems remove everything — including the minerals you want, with the wastewater and the plumbing bill that come with it. Osma is built for the gap in the middle.
See the comparison →We don’t grade our own homework.
Every Osma is engineered to NSF/ANSI 53 and 401 protocols and verified by an independent lab. Methodology is documented; certification publishing on a timeline this year.
See the full methodology →
From people who tested it themselves.
"The fluoride test strips don't lie."
I bought test strips before and after. Tap water came in around 0.7 ppm. After filtering: undetectable. Three months in, zero complaints.
"Slower than my old Brita. Worth it."
Takes ~11 minutes to fill. Plan ahead and it's a non-issue. The taste difference for tea and coffee is the part I didn't expect.
"Switched after the EPA stop-sale."
Had a Big Berkey for six years. After the 2024 EPA action I started looking. NSF certs, fluoride confirmed by my own strips, fits in the fridge. Smaller than Berkey, which is fine.