RO PPM 5 Before 2 filter DI

[BobL]

I have a 5-stage RO system. 3 Canisters with typical filters and 2 DI canisters. Getting 3-5 PPM TDS on an inline before the DI filters. Haven't used or tested the DI filters yet. Fixing too! Can I expect them to bring the PPM to zero?

Thanks

 

[griss]

3-5 after the membrane isn’t bad at all. Mine typically runs about 6-8. If you were getting the 3-5 after the DI, that would be a bit different. The RO membrane won’t remove all the impurities, that’s why we run the DI after the RO.

 

[griss]

Oh, misunderstood your question on the first read. Yes, you should be getting 0 after the DI.