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- Aug 21, 2015
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i have a brs 7 stage rodi unit something told me to test it and it is reading 0.03 phosphates i tested it twice to make sure my tds meter is reading 0 on all 3 stages the membranes are a couple of years old as far as the carbon blocks and resin i changed them a couple of months ago do i need to replace the membranes?


