Disinfecting a Reverse Osmosis System

[greg-cws]

Reverse Osmosis Sanitizing Procedure

RESIDENTIAL (UNDERCOUNTER / POINT OF USE)
1. Put ½ CC of hydrogen peroxide into Pre-filter and Post-filter.
2. Only sanitize membrane when you are replacing it. Put ½ CC hydrogen peroxide on the bottom of the membrane housing before inserting new membrane.
3. Turn system on and allow to run and sit idle for at least 3 hours.
4. Flush tank until empty.

COMMERCIAL ( POINT OF ENTRY - 0.5GPM OR GREATER, INCLUDING WHOLE-HOUSE R/O)
1. Into 10” BB housing, add 2 bottles of Pur-Gard.
2. Open drain fully.
3. Run for 5 minutes.
4. Stop and add 2 more Pur-Gard and set drain to regular and let it run.
5. Atmospheric tank add 5ml of hydrogen peroxide per gallon of water in tank.
6. Pressurize tank add 1ml of hydrogen peroxide per gallon of water in tank through the post water filter.

[SAWATER]

Is the residential procedure relative to only POU?
Are the whole house ROs considered commercial?

[greg-cws]

Great questions, see edits to the original post above.

[SAWATER]

One more question if I may. I think I know, but why hydrogen peroxide instead of chlorine?

[greg-cws]

Mainly because peroxide is so active. It works very quickly and requires less contact time than most other disinfectants.

The second reason is that peroxide decomposes to water and oxygen, so there are so unpleasant taste residuals in the system.

[ion_avenger]

Greg,what are your thoughts on peracetic acid instead of hydrogen peroxide, and what about pur-gard?