Fittings, valves & test kits
Accessories
The connectors, shut-off valves, dedicated faucets, test kits and add-ons that complete your Sentry H2O setup.
Choose your system
Sentry H2O Wellness System Replacement Filters
Sentry H2O Wellness System owners.
Sentry H2O Whole Home Revitalizer
Sentry H2O Whole House owners keeping performance up over the years.
Sentry H2O Peace of Mind Shut-Off Valve
Anyone who wants automatic leak protection.
Sentry H2O Dedicated Faucet w/ Redirect Valve & Fittings
Wellness System owners who want a dedicated drinking faucet.
Sentry H2O Water Test Kit
Anyone who wants to know exactly what’s in their water before they buy.
Sentry H2O · Subscribe & Save
Subscribe & save 15% on every Sentry H2O filter.
A Sentry H2O system is a one-time decision. The filters are the ongoing one — the part that actually keeps your water clean, year after year. Subscribe to any of them and we ship the exact replacement on schedule, with a reminder before you run low.
Wellness System Replacement Filters$129.99
Shower Replacement Filter$45
Portable System Replacement Filters$120Whole Home Revitalizer$75Subscribe & Save arrives with checkout — for now these link straight to the exact filter pages.
Real customers, real water
Loved by thousands of households
Verified reviews of Sentry H2O systems, independently collected by Judge.me.
Review of Whole House System
My whole house system
The whole house system was easy to hook up — had all the right parts to get it running in no time. I know I'll always have fresh, clean water, and it's nice not having water spots on the cars after washing them. What a great company with a great product.
Review of Sentry Shower Filter
Sentry shower filter
Easy installation, high quality, water is clear, no water smell and no more skin irritation. Just ordered a second one. Highly recommended!
Review of Sentry Shower Filter
Great Filter
I've been fighting hard-water discoloration on silver hair for a long time, and this filter worked wonders removing it. It also makes hair super soft and does wonders for the skin. Highly recommend!
Review of Whole House Wellness System
I love it!
I love it! One less thing to worry about in the house. I appreciate the company's help — everyone was so nice.
Review of BioChem OTG Bottle
Love the water bottle
I love the water system and shower filter — huge, huge difference. I bought the water bottle and love it too; I take it to restaurants and filter out the chemicals. Big thumbs up on the entire system.
Review of Whole House Wellness System
Whole house — positive review
The installation, setup and questions answered by Sentry's installer went seamlessly. We now have better-tasting water and no longer have water spots on our vehicles.
Review of Sentry Wellness System
Excellent filter system
We purchased the RV water filter and it is the key to better-tasting water. If you have well water, this is the solution you need.
Review of Sentry Shower Filter
Shower adapter & filter
Best thing I've bought in a long time — worth every penny and more. I've never felt so clean after a shower.
Reviews independently collected & verified by
Common questions
What is catalytic-carbon filtration, and how is it different from reverse osmosis?+
Catalytic-carbon filtration uses specially processed activated carbon that reacts with and breaks down contaminants as water passes through multiple stages. Unlike reverse osmosis, our Sentry H2O systems don't strip the water of everything -- they target the bad stuff while leaving naturally occurring beneficial minerals in place. You get cleaner, better-tasting water without wasting a drop or plugging anything into the wall.
Does the system need electricity or produce wastewater?+
No electricity, no drain connection, and no wastewater. Reverse osmosis systems can reject 3 to 5 gallons for every gallon they make; our Sentry H2O systems reject none and run on normal household water pressure. That means no extra drain line, no outlet, and nothing to plug in.
Does it change the taste or smell of the water?+
Yes -- for the better. Chlorine and chloramine drive most of that tap-water taste and smell, and the ToxyGuard stage is built to reduce both. The AlkaGuard stage then adds back trace minerals for a cleaner, rounder flavor, without the flat aftertaste reverse osmosis can leave behind.
What about chlorine and chloramine from city water?+
Both are specifically targeted by the ToxyGuard stage in every Sentry H2O system. Chloramine is notoriously hard to remove with standard carbon, which is exactly why we use catalytic carbon -- its enhanced reactivity breaks chloramine down more effectively, so your water smells and tastes clean straight from the tap.