Hmmmm....interesting that changing your filters brought your TDS down to zero. I was hoping I wouldn't be changing filters for at least another 3 months. And RO membranes should be good fo over a year.
Based on what my numbers were from new though...I think my filters are still good to go. My TDS downstream of the membrane has not changed.
I have read that both DrMark and Soild are using a "silicate" removing DI resin in their second DI canister. I'm not familiar with this. I'll have to give one of them a call.
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