Mountain Pure Water · Sentry H2O

The water your family drinks shouldn't be a guess.

Independent labs tested it. We match your home to the Sentry H2O system that fixes what they found — so you never second-guess the tap again.

Find my water match
4.92/5 from 457 verified reviews Every result from independent, EPA-certified labs
  • Independent, EPA-certified labs
  • German-engineered filtration media
  • Minerals kept in, not stripped out
  • Matched to your water in 60 seconds

Alive vs. stripped

Clean water that's still alive.

Reverse osmosis strips water down to something flat and lifeless. Sentry H2O doesn't just filter — it keeps the minerals, lifts the pH, and adds oxygen back.

  • Filtered
  • Alkalized
  • Oxygenated

Catalytic carbon takes out what shouldn’t be there and leaves the rest — then the ToxyGuard stage is designed to add oxygen back. Filtered, alkalized and oxygenated, not stripped and killed like reverse-osmosis water.

Alive means filtered, mineral-rich, oxygenated and better-tasting — a taste-and-character difference, not a health claim.

There's a health angle, too: the World Health Organization's own research documents what stripping the minerals out can mean for people who rely on demineralized water long-term. Not a scare story — just worth knowing. See what the evidence actually shows.

See the honest side-by-side See the lab numbers
Sentry H2O Reverse osmosis

Waste figure reflects typical reverse-osmosis systems. Source: U.S. EPA WaterSense, reverse osmosis efficiency guidance.

Real customers, real water

Real homes, real water

Verified Sentry H2O reviews — no stock quotes, no cherry-picking.

Verified reviews of Sentry H2O systems, independently collected by Judge.me.

4.92 /5 ★★★★★
Based on 457 reviews 91% Verified
Judge.me verified reviews
5 434
4 14
3 7
2 0
1 2
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Start here

What's really in your water?

"Treated" and "legal" don't mean what most people think. Start with the public data — then see how your own city measures up.

45%
of U.S. tap water carries at least one PFAS "forever chemical." USGS national study, 2023
2.1B
people worldwide still lack safely managed drinking water. WHO / UNICEF, 2025
~4M
lead service lines still feed U.S. homes. EPA lead service line inventory, 2024
Check your tap water
Salt Lake City, UT HAA9 582×

City contaminant overview

36+ contaminants
detected

16 exceed EWG’s health guidelines

Chromium-6ArsenicTTHMsHAA5 & HAA9NitratePFAS

and more across the Salt Lake City system

360,654 people served · EWG Tap Water Database

See the full report

Based on the EWG Tap Water Database, by water utility, plus each system's Consumer Confidence Report. Numbers vary by ZIP code, water system, and reporting period. EWG health guidelines are science-based benchmarks — not enforceable legal limits. A utility can fully comply with the law and still exceed them.

Measured, not promised

Up to

99.93%

less PFAS in your water — measured before and after by an independent lab.

PFAS are "forever chemicals" — they don't break down, and they build up in your body over years of drinking them. The EPA and ATSDR link long-term PFAS exposure to a higher risk of:

  • Kidney and testicular cancer
  • Liver damage and higher cholesterol
  • A weaker immune response — including reduced vaccine protection
  • Thyroid disruption
  • Developmental effects in infants and children

Across the forever chemicals the lab could quantify before and after the Sentry H2O under-sink system, reductions ran 97.44% to 99.93% — and most PFAS dropped to non-detect.

What PFAS does to your body
Sentry H2O under-sink dual filter infographic: untreated water flows in, through the ToxyGuard catalytic-carbon stage, then the AlkaGuard mineral stage, and clean water leaves the kitchen tap — 2-stage filtration
Two stages under the sink: ToxyGuard catalytic carbon, then AlkaGuard minerals.

Legal is not the same as safe

400×+

Salt Lake City's tap water passes every legal test. One PFAS "forever chemical" still measures over 400 times the health guideline.

Legal limits are compliance lines — many written decades ago around cost. Health guidelines are the stricter, science-based benchmarks families actually care about.

Legal on every count. Still 8× to 404× over the health guidelines, across seven contaminants.

See legal vs. safe Compare the technologies

The good stuff stays

Minerals kept in — not stripped out.

Reverse osmosis blasts water through a membrane until almost nothing is left. The AlkaGuard stage is designed to add calcium and magnesium back and gently lift the pH — lab-tested 6.83 → 8.21.

And upstream, the ToxyGuard stage adds oxygen back. So your water isn't just filtered and alkalized — it's oxygenated: alive, not stripped.

Calcium contributes to the maintenance of normal bones.²

Magnesium contributes to normal muscle function.³

Nutrient statements for the minerals AlkaGuard is designed to add back — not a claim about this product.

See the mineral science
pH 8.2

pH 6.83 → 8.21 · independently lab-tested (under-sink, Tempe)

Beyond your glass

Every filtered glass is a bottle that never gets made.

~0

single-use bottles a family of four can skip every year with filtered water on tap.

Shop whole home See the honest comparison

9%

of all plastic ever made has been recycled

OECD, 2022

~80%

still sits in a landfill or the environment

Science Advances, 2017

1M

plastic bottles bought every minute, worldwide

Euromonitor / The Guardian

Bottle count estimated from ~156–167 bottles per person a year (industry compilations) — yours depends on what you buy today. Plastic figures describe global plastic waste broadly; sources on file.

Why it's worth it

The difference you feel at home

A Sentry H2O system isn't a spec sheet. It's how your morning coffee tastes, how your skin feels, and never wondering what's in the glass your family reaches for.

  • Water that tastes alive

    Filtered, remineralized and oxygenated — crisp and full, never the flat, stripped taste of reverse-osmosis water.

  • Softer skin and hair

    Filter the shower where chlorine hits skin and hair every day, and feel the difference within the first week.

  • Better coffee, by the numbers

    Minerals kept in the SCA’s 75–250 ppm sweet spot pull fuller, more balanced flavor from every cup.¹

  • Goodbye, plastic bottles

    Bottled-quality water on tap — better for your wallet and the planet.

A family in a bright modern kitchen filling a glass of clean water, the Sentry H2O 3-stage under-sink system visible in the open cabinet below
4.92/5 457 verified reviews

Hard water & scale

The scale hard water leaves is wearing your home down.

Hard water carries dissolved calcium and magnesium. When it heats or dries, those minerals fall out and harden into scale — the white crust on a showerhead is just the part you can see. The expensive part builds up unseen, inside pipes, the water heater and every appliance on the line.

A chrome showerhead caked with white limescale from untreated hard water, beside the same style of showerhead kept free of scale — drag to compare With scale control Untreated hard water

The difference hard-water scale makes on one fixture. Salt-free scale control treats water at the point of entry so deposits like this never get the chance to build — it's prevention at the source, not a descaling scrub.

  • Water heaters work harder Scale insulates the heating element, so the heater burns more energy and wears out sooner.
  • Appliances age faster Dishwashers, ice makers and coffee lines all run mineral-laden water day after day.
  • Fixtures crust and spot The white film on showerheads and faucets is the scale you can see — the rest builds up unseen.
  • More soap, less clean Hard-water minerals fight your soap, so shampoo, detergent and dish soap all go further to do less.
  • Skin and hair never feel rinsed That tight, filmy after-shower feeling is a classic hard-water complaint.

Salt-free scale control changes that. The Sentry H2O whole-home system treats water where it enters your house — managing the minerals before they harden onto your pipes, water heater and fixtures, without the brine tank or bags of salt a traditional softener needs.

But the right fix starts with knowing your numbers. Find out exactly what's in your water first.

Get a free water test

Curious what it all adds up to? Read what hard water really costs your home →

Know your water

What's really in your tap water?

Enter your ZIP and see the contaminants found in your local supply — with the EPA legal limit, the stricter health guideline, and how far over it runs. No leaving the page.

Open the full water-report tool →

Mountain Pure Water · Free local service

Local? Know what's really in your water — free.

If you're within about 90 minutes of Draper — the Wasatch Front and nearby valleys — we'll test your water at home, walk you through the results in plain English, and leave the decision entirely with you.

Get my free water test

Free · in-home · zero pressure — if your water's fine, we'll tell you that too.

Seen on Instagram

Utah's water problem is going viral

Millions of views on what's coming out of Utah taps. We build the fix.

1 / 5 Swipe, scroll or use the arrows

Third-party content shown via Instagram's public embed feature. Views and claims belong to their creators, not Mountain Pure Water.

Where to next

Your water, matched — start here

Four ways in. Pick the one that fits where you are.

Sentry H2O replacement filter cartridges lined up beside a row of single-use plastic water bottles
Start here

Shop filters

The three filter types — and the exact one your home's water needs.
A serene, light-filled luxury bathroom with a large window framing snowcapped alpine peaks

Whole-home filtration

Clean, mineral-rich water at every tap, shower and appliance in the house.

 A bright open kitchen with a huge window over the sink looking out to a mountain lake and snowcapped peaks

Under-sink Wellness System

Lab-backed drinking water at the kitchen tap — about a 30-minute DIY install.

 A glass being filled with clear water from a kitchen faucet

Learn

Plain-English answers on PFAS, reverse osmosis, hard water, minerals and more.
  1. 1. Specialty Coffee Association (SCA) Golden Cup Standard — recommended brewing water 75–250 ppm total dissolved solids. Taste is subjective and varies by coffee and roast.
  2. 2. Calcium contributes to the maintenance of normal bones — EU Commission Regulation (EU) 432/2012, EFSA-approved nutrient claim.
  3. 3. Magnesium contributes to normal muscle function — EU Commission Regulation (EU) 432/2012, EFSA-approved nutrient claim.

Free shipping

On every order over $99

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

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