RODI Question

cadugauch · Jul 18, 2013

i am about to reorder my filters and membrane but wanted to make sure my system is correct.

Since i have little space under my kitchen sink, i have been using this portable RODI from PureWaterClub for over 2 years. I have been replacing all filters every 3 months (some) and membrane every 8-9 months (starts to smell FISHY). I always have TDS 0 out to tank/drinking water...and now it got to 10 so time to change. Any input would be greatly appreciated!! The good thing about this system is that i can add/remove/replace position of all components.

nivram · Jul 19, 2013

Your membrane should last a lot longer.

cadugauch · Jul 19, 2013

nivram said:
Your membrane should last a lot longer.

Thats what i am trying to figure out...whats wrong with my system

jduck · Jul 19, 2013

You would be better off placing both carbon blocks before the RO membrane.

Unless its not a full 10" carbon filter

nivram · Jul 22, 2013

Goto this site and find a comparable to unit. Then follow the diagram. I wonder if chlorine is getting to your membrane.

http://www.airwaterice.com/category/vv/

cadugauch · Jul 22, 2013

i think the problem is that i never flush my membrane...i didn't really know i had to do that...i am ordering a new set of filters and a flush kit...hopefully that will solve the problem

Planedoc · Jul 22, 2013

Chlorine will destroy your membrane. That is why most system use two carbon filters before membrane. After the first DI filter you have pure water. Placing a carbon filter after a di filter has no useful purpose. The point of running two di filters is to maximize the life of your di resin. Put new resin in last filter and move the old last filter to first position and throw way resin from first filter at every resin change.
You did not specify but it's best to measure TDS after membrane and after di to better understand what is going on.

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Buckeye Field Supply · Jul 27, 2013

The small inline GAC filters are not a good fit in this configuration - they are not intended to be used as prefilters for high capacity membranes. As mentioned above, if you have two of them, put them both after the sediment filter and before the membrane. Is your tank pressurized or unpressurized?Why have you been replacing your membrane so often?Make sure your di cartridges are oriented vertically.As you're seeing although the mini systems are inexpensive to buy upfront, the cost of ownership over time is high.Russ