Product imagery from Sentry H2O.
Clean, great-tasting drinking water at your kitchen tap — chlorine, fluoride, PFAS, lead and arsenic taken out, alkaline minerals added back.
Select your water source
City water gets DualGuard: ToxyGuard breaks down chlorine, chloramine, lead and arsenic, then AlkaGuard adds calcium and magnesium back for great-tasting water. In independent lab testing of the system, most PFAS compounds reached non-detect.
0
gallons wasted
no drain line
6.8 → 8.2
pH — minerals added
back, not stripped
~30 min
DIY install
included fittings & cutters
See it, then taste it
One glass is flat and stripped. The other is bright and mineral-rich — the difference you can taste in the first sip.
Catalytic carbon breaks down chlorine and chloramine — the pool-water smell most cheap filters leave behind is simply gone.
The AlkaGuard stage is designed to add calcium and magnesium back and gently lift the pH — never stripped of its minerals like reverse-osmosis water.
Better-tasting and mineral-rich — a taste difference, not a health claim.
See what the WHO's own research found about mineral-depleted water →
What you're living with
Chlorine and chloramine you can smell before you taste — flavoring every cup of coffee, every ice cube and every pot.
Lead, arsenic, PFAS and chlorine byproducts can pass the legal tests and still reach your glass — this system takes them out, verified in the lab results below.
RO blasts out the minerals along with the bad stuff — and wastes 3 to 5 gallons doing it.
Cases in the cart, empties by the bin, money down the drain.
Sentry H2O fixes all of them — clean, mineral-rich water straight from your tap, with nothing hauled home and nothing sent down the drain.
Get the highlights
No drain line, no wastewater. A typical reverse-osmosis system sends 3 to 5 gallons down the drain for every gallon it makes.
Catalytic carbon built on German-engineered technology, adapted with US engineering.
AlkaGuard is designed to add calcium and magnesium back — lab-tested pH 6.83 → 8.21.
Included fittings and tube cutters — works with a dedicated faucet, your fridge line, or both. No plumber, no drain line.
Built in stages
Catalytic carbon targets chlorine, chloramine, lead, arsenic and fluoride, and an oxygenation stage adds oxygen back; AlkaGuard is designed to add calcium and magnesium back and gently lift the pH. So your water is filtered, alkalized and oxygenated — and in independent lab testing of the full system, most PFAS compounds reached non-detect. Optional BioChemGuard adds a submicron bacteria, virus and cyst barrier for wells.
Stage 1 · catalytic carbon
Catalytic carbon and reduction media break down chlorine, chloramine, fluoride, lead and arsenic as water passes through — and an oxygenation stage adds oxygen back. (PFAS is measured for the system as a whole — see the lab results.)
Stage 2 · minerals back in
Designed to add calcium and magnesium back and gently raise pH — the minerals reverse osmosis strips out are kept in, for a cleaner, rounder taste.
Optional · wells (TriGuard)
Optional third stage for wells: a NASA-derived submicron barrier that reduces bacteria, pathogen-based viruses and cysts (by at least 99.98%), right at the tap.
Stage names and targets match our published independent lab results. BioChemGuard is an optional third stage on the TriGuard (well) configuration.
The details
Specifications reflect the manufacturer (Sentry H2O). Sentry H2O reports its systems are tested to NSF standards; certification documents are being finalized, so we do not call them NSF certified. See our Science page for published independent lab reports and testing gaps.
Sentry H2O · Subscribe & Save
Sentry H2O systems are built to last years — the filter change is what keeps them performing like day one. Subscribe and we ship the exact replacement on schedule, with a reminder before you run low.
Shop Wellness System Replacement FiltersSubscribe & Save arrives with checkout — for now this links straight to the exact filter page.
Straight answers
Families who want clean, great-tasting drinking water at the kitchen tap. On a well or worried about bacteria? The TriGuard 3-filter config adds a BioChemGuard stage for bacteria and viruses. Not sure? Our 60-second quiz confirms fit in a minute.
DualGuard (2 filters) suits city water. TriGuard adds a third BioChemGuard stage — a submicron barrier that reduces bacteria, viruses and cysts — the right call for wells, homes near farmland, after flooding, or anyone who wants the extra margin.
The DualGuard drinking filters are a once-a-year swap. Subscribe to auto-ship and we send the exact refill on schedule with a reminder.
No. There is no drain line and no wastewater. A typical reverse-osmosis system sends 3 to 5 gallons down the drain for every gallon it makes — the Wellness System sends none.
Sentry H2O reports that its systems are tested to NSF standards. Certification documents are being finalized, so we do not call the systems NSF certified. The independent lab reports on our Science page are third-party testing, not certification.
It runs your water through up to five sequential stages under your sink. ToxyGuard works on chlorine, chloramine, fluoride, lead and arsenic; AlkaGuard then re-mineralizes the water and raises its pH slightly for a cleaner taste. On well water, the optional BioChemGuard TriGuard third stage adds a submicron barrier against bacteria, viruses and cysts. And in independent lab testing of the full system, most PFAS compounds reached non-detect.
Yes -- and we can point to the test. In independent before-and-after lab testing of the Sentry H2O Wellness System, most PFAS compounds reached non-detect; where both values were quantified, reductions ran 97.44% to 99.93%. That's a measured result for the system as a whole (see the Science page for the full report), without the waste stream or complexity of a membrane system.
About 15 minutes, no plumber and no special tools. It fits under a standard kitchen sink and connects to your existing cold-water line -- there's no drain line to run and no electrical work, because the system needs neither. A step-by-step guide is included and our team is on hand if anything comes up.
Real customers, real water
Verified Sentry H2O reviews — including this exact system.
Verified reviews of Sentry H2O systems, independently collected by Judge.me.
Reviews independently collected & verified by
Not sure which configuration fits? Take the 60-second water finder, or read the full independent lab results.
By Jason Preston, Founder · July 2026 · Educational guidance only — not health or medical advice. Reduction results depend on water chemistry, flow rate and system configuration; your results may differ. Independent lab testing, not an NSF/WQA certification.
Know your water
Check the public data, test your tap, then match your home to the right Sentry H2O system.
Your area's annual Consumer Confidence Report (CCR) lists what has been detected in your municipal tap water.
Salt Lake City? See what's really in your water →Enter your zip code for a plain-language breakdown of the contaminants found in your local supply.
Open the EWG database →A mail-in lab kit such as Tap Score by SimpleLab tells you exactly what is in your own water.
Get a Tap Score kit (SimpleLab) →Want help matching the result to a Sentry H2O system?
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30-day money-back
Taste it on your own water first
Lifetime housing warranty
All housings & durable hardware (filters & media excluded)
Lifetime support
Real people — phone & email
Wally
Water finder
AI can make mistakes. Pricing confirmed at checkout.
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