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Important Note: Reverse Osmosis water purification systems remove most contaminates in
drinking water, however there is no guarantee on the quality of the final product. In addition to
that, it is important that you are aware that bacteria can grow within your RO system, and thus we
recommend using this sanitization procedure at least one a year to prevent and eliminate any
bacteria growth. If your system has a UV filter this will eliminate bacteria in your final product
water, however, the UV filter is one of the last stages, so the majority of the water in your system
may still contain bacteria. The bacteria still has the opportunity to grow in your system and
damage your membrane, so even if you have a UV filter it is recommended that you use this
procedure. We recommend sanitizing during a filter change, that way the old filters can be
removed and thrown away, the system can be sanitized, then new filters put in.
Sanitization Procedure:
1. Turn off the feed water supply by closing the angle ball valve. The valve is closed when the
handle is at a 90° angle to the tubing (when handle is NOT parallel to tubing). If saving water
from the tank, do so after closing the valve.
2. Open the faucet to allow the tank to empty. This water may be saved if so desired. Leave the
faucet open until no more water comes out.
3. Close the faucet.
4. Pull the system out to where it can be easily worked with. If the system was installed with
enough tubing to do so, simply pull it out to where it can be worked on. If the system does not
have enough tubing, you will need to disconnect the lines to pull it out. (When changing the
membrane, it helps to have a towel handy, as some water may leak out.) Make note of which
tube goes where to ensure the system will be hooked up the same way it was.
5. Remove all filters and the membrane from their housings, leave the inline post filter in place.
6. Add one capful (2 tsp or 10ml) of 5 ¼% bleach (any household bleach, such as Clorox®, will
work) to each filter housing and the membrane housing.
7. If the system was unhooked, hook it back up now. Ensure the bypass valves are in position for
DI water so the DI housing gets sanitized as well.
8. Open the feed water supply and allow water to fill the housings. Open the tank valve and allow
5 - 10 minutes for water to fill the tank.
9. Open the faucet to allow solution to enter lines. Close the faucet and feed water line when
water begins to come out of the faucet.
10. Let solution stand in system for 15 minutes.
11. Open the feed water line and then then open the faucet.
12. Allow water to run through the system for 15 - 20 minutes to flush the lines, closing the faucet
at least once to allow the tank to fill again.
13. Install new filters (the inline filter MUST be replaced as detailed in the filter changing
instructions, since the chlorine will exhaust it).
14. Insert membrane (either the original or a new one) into membrane housing.
15. Ensure housings are tight and all connections are secure.
16. Flush the system as detailed in the filter change instructions to clean out the new filters.
17. Your system is now sanitized and ready to use.
AFW RO System Manual
©Abundant Flow Water System, Inc. 2009
System Sanitization:
[12]
Revised 9/09
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