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If you've been using the same R/O membrane for 12 years, then my first guess would be that the membrane is shot. I would measure the tap water TDS and then measure the TDS of water coming out of the membrane (not through the DI). You should see approximately a 90% reduction in the TDS. If not, your membrane is not working and should be replaced.
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Every neighborhood has one. In my neighborhood, he is me.
Current Tank Info: 3 reef tanks, 15-180g
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