Quote:
Originally Posted by Blue Ram
- DI (used for reef system) 011 ppm
- RO (used for drinking water) 022 ppm
I have not tested the RO membrane as the system has been used for only 11 months and the product info indicates replacement every 2yrs.
Is 011 ppm acceptable.
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Have you calibrated your TDS meter?
You said you didn't test the RO membrane, but you say RO for drinking water is 22 ppm. How is this different? If there is indeed 22 ppm coming out of the RO membrane it needs to be changed. DI resin will take out up to 20 ppm, but will burn out very quickly with this amount going in.
RO membranes generally last a few years, but this depends on the amount of TDS going in. The membrane will last a lot longer if there is only 60 ppm in the tap water versus 800 ppm in the tap water. Have you tested your tap water? What is it at? With the RO membrane already putting out 22 ppm in such a short period of time your tap water must be fairly high which would indicate a need to use dual RO membranes.
What is the flow rate for your RO? Does it happen to be 100 gpd? I ask because the 100 gpd membrane is less efficient than other membranes at only 96% rejection where most other membranes are 98% rejection.
I change the RO membrane when it gets to 12 ppm in the effluent, and I changed DI resin as soon at it gets to 1 ppm in the effluent.