Ryan Posted April 24, 2009 Share Posted April 24, 2009 I have been using a RO/DI filter for a year now. I have been thinking about replacing the RO membrane & DI resin, so I decided to get a TDS meeter to determine how well my current membrane and resin is working before I replaced them. I was shocked to find out that the water GOING IN TO my RO/DI unit is only at 7-9 TDS!!! This seems really low to me, does Portland have really clean water or something? How are your TDS? Quote Link to comment Share on other sites More sharing options...
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