1. The reverse osmosis membrane is just one of the many basic
components you find in RO filter systems.
2. Cold water line valve, which is the water source for the RO
3. Pre-filter(s), which takes in the water from the cold-water
line valve. There may be multiple pre-filters in a system. Most pre-filter types include
sediment filters and carbon filters. Sediment water filters are designed to remove sediments
like dirt, sand, dust, and silts, while carbon water filters remove chlorine. Carbon filters may
be absent in some RO water systems with a cellulose tri-acetate(CTA) membrane.
4. Post-filter(s) – water from the RO storage tank goes through
the post filter(s) before it gets to the RO faucet. These filters are mostly carbon, and this is
the stage where odors and tastes are removed via post-filtration processes.
5. Automatic shut off valve (ASOV) is included to stop water
from entering an already full storage tank. It shuts off the flow of filtered water, and
ultimately the flow of water into the drain. It opens when the pressure in the tank drops to
allow the flow of water into the membrane and wastewater to the drain.
6. Check valve, which ensures that pressurized filtered water
in the storage tank is not forced back to the RO membrane when the ASOV has blocked the feed
7. Flow restrictor, for regulating the water flowing through
the RO membrane. It sets the flow rate that is best for the highest quality drinking water and
maintains the same. You can find it in the RO drain line tubing.
8. Storage tank is where the filtered water is stored until it
is drawn out of the faucet. It comes in different sizes and contains a bladder that maintains
the right internal pressure when it is full.
9. Faucet, commonly installed on the kitchen sink, is where you
draw the filtered water from.
10. The drain line is the line that connects the outlet end of
the RO membrane to the drain. Contaminants that cannot make it through the RO membrane passes
through the drain line out of the RO water system.
The following claims have not been tested and certified by NSF: compatibility claims.
The above statement is accordance with the NSF General Policy 25. Please note the certification information is only applicable to Waterdrop, not representing other brands on this page.