Reverse Osmosis Systems
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These Systems reduce:
Sediment
TDS
Chlorine
Lead
Arsenic
Mercury
Fluoride
Pesticides
Herbicides
About Reverse osmosis systems
A reverse osmosis system is a point-of-use drinking water treatment that removes dissolved contaminants by forcing water through a semi-permeable membrane under pressure. Residential units install under the kitchen sink and supply a dedicated faucet. The membrane rejects 95 to 99 percent of total dissolved solids, including lead, arsenic, nitrate, fluoride, sodium, and PFAS, which is why reverse osmosis is the recommended treatment for wells with difficult chemistry and for households on municipal water that want the highest level of purification for drinking and cooking. Pitchers and faucet-mount carbon filters improve taste and remove chlorine, but they do not remove dissolved solids.
A reverse osmosis water filter has three core stages while some have additional stages as well. The sediment pre-filter removes particles that would clog the membrane. The carbon pre-filter removes chlorine, which would otherwise degrade the membrane. The membrane separates purified water, which flows to a pressurized storage tank, from rejected contaminants, which are flushed to drain. Optional stages can include a booster or permeate pump for homes with supply pressure below 40 psi, a remineralization cartridge for people who prefer a mineral taste, and a catalytic carbon stage for municipal water treated with chloramine.
Choosing a reverse osmosis system depends on your source water and your household’s needs. Well water should be tested first, because iron, manganese, hardness, and bacteria must be treated ahead of the membrane. Daily production capacity and tank size matter if the system will also feed a refrigerator or ice maker. Replacement filter cost and availability matter because a reverse osmosis water filter only performs as designed when pre-filters are changed every six to twelve months and the membrane every two to five years. The systems above range from compact four-stage units to higher-output models with pumps and remineralization, and replacement cartridges and membranes for all of them are typically readily available and stocked in Canada.
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Reverse Osmosis Water Filter FAQ
What is a reverse osmosis system?
A reverse osmosis system is a point-of-use drinking water treatment that forces water through a semi-permeable membrane to remove dissolved contaminants. Residential units install under the kitchen sink, store purified water in a small pressurized tank, and feed a dedicated faucet. The membrane rejects 95 to 99 percent of total dissolved solids.
How does a reverse osmosis system work?
Household water pressure pushes water against a membrane with pores small enough to block dissolved contaminants. Purified water passes through to the storage tank while the rejected contaminants are flushed to drain. A sediment pre-filter and a carbon pre-filter protect the membrane, and a carbon post-filter polishes the taste before the water reaches the faucet.
Does a reverse osmosis water filter remove fluoride?
Yes. A reverse osmosis water filter removes 85 to 95 percent of fluoride. Carbon filters by themselves do not remove fluoride, so reverse osmosis is the most practical option for households that want to reduce it in their drinking water.
What is the difference between a 4-stage and 5-stage reverse osmosis system?
A 4-stage reverse osmosis system has a sediment pre-filter, carbon pre-filter, membrane, and carbon post-filter. A fifth stage usually adds a second carbon pre-filter for chloramine-treated water or a remineralization filter after the tank. More stages are only better when each one addresses a real condition in your water.
Does a reverse osmosis system remove chlorine and chloramine?
The carbon pre-filter in a reverse osmosis system removes chlorine before water reaches the membrane. Chloramine requires a catalytic carbon cartridge. This matters because both chemicals degrade thin film membranes, so confirm the system is equipped for chloramine if your municipality uses it. If you are unsure, you check whether your Canadian city or town uses chlorine or chloramine here.
Where should a reverse osmosis water filter be installed?
Under the kitchen sink is standard, since that is where the faucet, cold water feed, and drain are. A reverse osmosis water filter can also be installed in a basement or utility room with a line run to the kitchen, which frees up cabinet space and makes filter changes easier.
What is the difference between a tank and a tankless reverse osmosis system?
A tank reverse osmosis system stores purified water in a pressurized bladder tank so it is available instantly. A tankless system produces water on demand with an electric pump, saves cabinet space, and avoids tank-related pressure loss, but it requires power and generally costs more.