HOME WATER & REVERSE OSMOSIS SYSTEMS
Not every water challenge happens in the field. Whether you're building out a serious home preparedness setup, addressing contaminants identified in a water quality test, or simply upgrading the water quality in your home for the long term, the solution is a fixed installation water treatment system, and the same principles that guide Cana's field gear apply here: treat for what's actually in your water, build in redundancy, and don't compromise on the equipment you depend on every day.
This collection covers home and point-of-use water treatment solutions — reverse osmosis systems, under-sink filters, countertop units, and supporting components for stationary water treatment at home, at a base location, or in any fixed installation environment. We carry iSpring RO Systems, selected by the same standards we apply to everything else in the Cana catalog.
Not sure what system is right for your water? Start with our Water Quality resource page to identify what's in your municipal supply or get your water professionally tested — then come back here with a clear picture of what you're treating for.
iSPRING REVERSE OSMOSIS SYSTEMS
iSPRING REPLACEMENT FILTERS
Reverse osmosis pushes water through a series of filters and a semi-permeable membrane with pores as small as 0.0001 microns. Sediment and carbon pre-filters first remove particles, chlorine, and odors; the RO membrane then strips out dissolved solids, heavy metals, and other contaminants; and a final post-filter polishes the water for taste. The result is clean, crisp drinking water — typically far purer than what a pitcher or faucet-mounted carbon filter can produce.
A quality RO system reduces up to 99% of over 1,000 contaminants, including lead, arsenic, fluoride, chlorine, PFAS "forever chemicals," nitrates, asbestos, mercury, sodium, and total dissolved solids (TDS). Look for systems certified to NSF/ANSI Standard 58, which independently verifies contaminant-reduction claims.
Yes. RO water is among the cleanest drinking water you can produce at home. Because RO also removes some beneficial minerals along with contaminants, many people prefer a system with an alkaline remineralization stage that adds calcium, magnesium, and potassium back in and balances the pH for a smoother, more natural taste. A balanced diet easily provides the minerals RO removes, so remineralization is about taste and preference rather than a health requirement.
Reverse osmosis does remove minerals such as calcium and magnesium along with contaminants. For most people this isn't a health concern, since these minerals come primarily from food. If you'd like them back for taste or preference, choose a 6-stage system with an alkaline/remineralization filter, which restores key minerals and raises the pH.
Under-sink systems install permanently below your sink, connect to your water line, and dispense through a dedicated faucet — ideal for a clean look and high daily capacity. Countertop systems are portable, require no plumbing or installation, and simply plug in — ideal for renters, RVs, offices, or anyone who wants filtered water without modifying their kitchen. Both use the same core RO technology.
Most under-sink RO systems are designed for DIY installation and include everything you need, along with step-by-step instructions and video guides. If you're comfortable with basic hand tools you can usually install one in about an hour. Countertop models need no installation at all — you just fill or connect them and plug in.
As a general rule, sediment and carbon pre/post filters last around 6–12 months, while the RO membrane lasts about 2 years, depending on your water quality and usage. Many systems include a smart monitor or reminder to tell you when a change is due. Buying a multi-year replacement filter pack is the easiest way to stay stocked and keep your system performing.
RO systems send some water to the drain to flush away concentrated contaminants, expressed as a "pure-to-drain" ratio. Older systems can waste several gallons per gallon produced, but efficient modern systems reach ratios as favorable as 2.5:1 or better (more pure water, less waste). Higher-efficiency and 200 GPD systems are worth looking for if water conservation is a priority.
GPD stands for gallons per day — the amount of purified water a system can produce in 24 hours. A 75 GPD system comfortably handles a typical family's drinking and cooking needs, while a 200 GPD system suits large households, offices, or homes that also feed a fridge or ice maker. More GPD also generally means faster refill and better efficiency.
Reverse osmosis can treat many well-water contaminants, but private wells vary widely and may contain high sediment, iron, bacteria, or hardness that require pre-treatment first. If you're on well water, test your water and check each system's guidelines — some are rated for city water only, while others can be paired with additional pre-filtration or UV sterilization for well applications.
NSF/ANSI Standard 58 is the recognized standard for reverse osmosis drinking water systems. Certification means an independent body has tested the system and verified its contaminant-reduction claims — so a certified system's performance is proven, not just advertised. It's one of the most reliable trust signals when comparing RO systems.
Pitcher and faucet-mounted filters mainly use carbon to improve taste and reduce chlorine, but they leave behind many dissolved contaminants like lead, fluoride, nitrates, and TDS. Reverse osmosis uses a membrane to remove contaminants a carbon filter can't, producing significantly purer water. An RO system also costs far less per gallon over time than bottled water.
For a microfilter, meeting the EPA Guide Standard means removing 99.9% of protozoa and removing 99.9999% of bacteria in all required water types. To be classified as a purifier, the device must meet the EPA Guide Standard for the removal of protozoa and bacteria as well as virus which must be inactivated to 99.99% in all required water types.
All of the these filters and purifiers have passed the levels of inactivation required by the EPA Guide Standard.