While my tds after DI is always 0, the tds after RO (before DI) will climb to 10 or more if I don't open the bypass valve and flush the membrane. Like I said, I usually do it when I see it climb to a few ppm, and then it is back down to 0 after the flush. Normally, my gauges show 0:0 or 1:0.
The water out of my tap in Langley is about 50 tds normally. However, it must be higher at times (although haven't caught it in a test), because my sediment and carbon filters still need to be changed about every 4 months or so. I can tell when they need changing because my flow slows down, and it takes longer to fill the pressure storage tanks. And I am always amazed at the red/brown sediment in the pre-filters, despite the seemingly clear tap water.
I still don't think fast flow through the DI is a problem though, as I have that with my RO pressure storage tanks. I do agree though, you should have an RO membrane.
Last edited by Reef Pilot; 12-23-2012 at 02:12 PM.
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