Hi Scott,
I got dual TDS meter (J&L), 9 coming in 0 out of RO, I don't bother measuring after the DI. I was also questioning the accuracy of this meter.
I have been using my membrane for 3 years.
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Denis
150g SPS reef;3x250WHQI,Tunze Streams,Wavebox,Neptune Apex,fishroom in basement  ,reefing since 93,SPS since 99.
TOTM June 2010
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