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What is the tds of your tap water? 20ppm will wear DI resin down failry quickly. Unless your incoming tds is really high, your membrane should be taking your tds a lot lower then that. What kind of unit do you have? How many gpd? Is your tds meter calibrated?
tom
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"I got me a big wave, ride me a big wave, got me a big..WAVE!" Ed Veddar
It's a reef thing, you wouldn't understand!
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