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 · Replacement filters
The right replacement filters for your system.
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 once and the exact replacement set for your system arrives every 12 months at 10% off, or buy a one-time set.
Sentry H2O Wellness System Replacement Filters$120
Sentry H2O Shower Replacement Filter$45
Sentry H2O Portable System Replacement Filters$120Eligible purchase options are shown on each exact Sentry H2O filter page.
Real customers, real water
What Sentry H2O customers say
Sentry H2O store review snapshot, independently collected by Judge.me, as of August 2026.
Reviews of products in this category
Each card names the product reviewed.
August 2026 review-count snapshot.
Rating, count and verification rate checked on Judge.me September 15, 2026.
See the Sentry H2O store reviews →Review of SENTRY WELLNESS SYSTEM REPLACEMENT FILTERS
Second year
We've had the under-sink filter for the last year, and it was easy to buy a replacement for year 2.
Review of 1/4" Dedicated Faucet Connection (Direct RO Replacement)
It works great and easy to install.
Review of Peace of Mind Shut-Off Valve
Highly recommended
Don't order without it!
Review of SENTRY WELLNESS SYSTEM REPLACEMENT FILTERS
Filters
The customer service team was very helpful since we forgot what kind of filters that we needed. The filters replacement came very quickly and easy to install the replacement filters. The water tastes better than the water from refrigerator.
Reviews independently collected & verified by
Common questions
How do I handle a return, shipping damage or a warranty claim?+
Contact Mountain Pure Water first at (435) 990-3778 with your order number and details of the issue; include photos for shipping damage. We coordinate the review and issue any return instructions, including the correct destination. Wait for our instructions before sending anything back. Shipping damage, including broken fittings, is reviewed case by case. See our Shipping, Returns & Refunds policy for the 30-day return window, restocking fees and warranty terms.
Is shipping free?+
Free Ground shipping on every order, contiguous US. No minimum. Shipping is $10 to Alaska, Hawaii and Puerto Rico. We ship to US addresses only. See our Shipping, Returns & Refunds policy for details.
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. The non-RO city filtration stages produce no RO reject-water waste.
Does the system need electricity or produce wastewater?+
Our non-RO city filtration stages run on water pressure and produce no RO reject-water waste. UV accessories require power. Well treatment may produce waste or backwash water; requirements depend on the selected configuration.