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I believe, correct me if I'm wrong, your output water should read 0 or close to it.
 

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I have an aquaticreefsystems RO/DI and my reading is usually 0. I check it monthly and when it gets above 5-6 I replace the filters.
 

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alot of Municiple water is in the 100-200 range. After the RO it should be uner 15ish, after the DI it should be under 2. Zero is preferred.

Dave
 
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