Thread: DI water
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Old 06-30-2007, 05:21 AM
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How quickly you need to change the DI resin is dependant on the TDS of your tap water. The lower the TDS, the longer between changes.

You could buy a TDS meter or ask your local city government. But probably the easiest way to tell is to ask a local reefer or an LFS that deals in SW.
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