Find the Right Water Filter
Find the Right Water Filter
Most households start with a drinking-water filter they can install themselves. The Sentry systems we carry treat the water already coming out of your tap. When the tap is not an option, we also sell emergency drinking water by the pallet.
Choose by the job you need done, not by jargon. Every filter on this page still needs running water, so we recommend keeping a stored supply on hand for outages.
Start with what you need
City water
DualGuard Wellness System
From $380
Two-stage filtration for typical municipal water. Sentry’s ToxyGuard stage is aimed at common contaminants and scale, and the AlkaGuard stage adds minerals and supports higher alkalinity. Installs under the sink in about 15 minutes, with no plumber required.
Want a shower filter in the same order? The Wellness Home Bundle starts at $379.95 and pairs a DualGuard or TriGuard system with a shower filter.
Shop DualGuard Shop the Home Bundle
Filters need running water. Pair it with a stored water supply for outages.
Well water, flood-prone areas, or more contamination concern
TriGuard Wellness System
From $495
Adds a third stage, BioChemGuard, which Sentry describes as targeted treatment for bacteria, pathogen-based viruses, and PFAS/PFOS. Choose this if you are on a well, live in a flood-prone area, or want the extra stage on city water.
The same TriGuard option is available in the Wellness Home Bundle.
Filters need running water. Pair it with a stored water supply for outages.
RV, travel, or off-grid
Portable System
From $499.99
A compact, self-contained system for campers, RVs, and temporary setups. It uses the same DualGuard media as the under-sink system, with a Premium option that adds BioChemGuard.
Filters need running water. Pair it with a stored water supply for outages.
Shower
Shower Filter
$109.99
A compact shower-head filter for bathing only. It is not a drinking-water filter. Sentry says it installs in minutes on a standard shower arm.
Filters need running water. Pair it with a stored water supply for outages.
Whole home
Whole House System
From $4,750
Treats water at the point it enters the house. Sentry’s city configuration uses ToxyGuard plus a revitalizer; a well-water configuration is also available. An under-sink DualGuard system is included so you still have a dedicated drinking-water stage at the kitchen.
Filters need running water. Pair it with a stored water supply for outages.
When the tap is not an option
Emergency stored water
Sold by the pallet
Ready Pantry 12 oz Emergency Water is for times the tap is shut off, unsafe, or unreachable. It is sold as a half pallet (50 cases) or a full pallet (100 cases).
DualGuard vs. TriGuard
| DualGuard | TriGuard | |
|---|---|---|
| Stages | Two: ToxyGuard and AlkaGuard | Three: ToxyGuard, AlkaGuard, and BioChemGuard |
| ToxyGuard | Sentry describes this stage as defending against common contaminants with comprehensive toxin removal, scale control, and added oxygen. | |
| AlkaGuard | Sentry describes this stage as enriching water with minerals and supporting increased alkalinity. | |
| BioChemGuard | Not included | Sentry describes this extra stage as targeted treatment for bacteria, pathogen-based viruses, and PFAS/PFOS. |
| Best for | Typical municipal (city) drinking water | Well water, flood-prone areas, or anyone who wants the third stage |
| Price | From $380 | From $495 |
Both options live on the Wellness System product page. The Wellness Home Bundle lets you pair either one with a shower filter, starting at $379.95.
Install and upkeep
- Sentry says the under-sink and portable systems install in about 15 minutes, with no plumber and no special tools.
- The shower filter installs on a standard shower arm.
- Plan on changing the under-sink and portable filters about once a year. Those systems are rated up to 3,000 gallons at 1 gallon per minute.
- Whole-house systems follow a different revitalizer service schedule; details are on the product page.
Frequently asked questions
Do I need a plumber?
Sentry says the under-sink, portable, and shower filters are designed for self-install and do not require a plumber. Whole-house installation is a larger project; review the product page and install video before you order.
How often do I change filters?
Once a year is the typical schedule for the under-sink and portable systems, or after about 3,000 gallons at 1 GPM, whichever comes first. Replacement filters are listed with each product. The shower filter also has its own replacement cartridge.
Can I drink the shower-filtered water?
No. The shower filter is for bathing only. Use DualGuard, TriGuard, the Portable System, or the Whole House drinking stage for water you plan to drink.
What if the water is shut off?
These filters only work when water is flowing through them. For boil-water notices, shutoffs, and other times the tap is not an option, keep Ready Pantry 12 oz Emergency Water on hand. It is sold by the half pallet (50 cases) or full pallet (100 cases).
Where can I read the lab reports?
We host the reports on our Water Lab Results page. Results vary by water source, system configuration, and conditions. PFAS-specific results have been described as coming later.
Important: These filters are for everyday tap water. They are not a substitute for official boil-water or do-not-drink advisories from your local authorities. Keep a stored supply of emergency drinking water for outages and emergencies. Lab results vary by water source, system configuration, and conditions.