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My TDS coming from the DI is now reading 1. Should I replace my DI resin? The TDS going in to the DI is 2 but it takes about 15 mins for it to get down that far. Should I just replace all the filters since it will only be like $25. I am using the BRS 4 Stage value RO/DI. I have been using this system for about 7 months.
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