Originally Posted by Good Alex http:///forum/post/2612445
ive had the rodi unit set up for about a year, and the tds meter just hit 3, which filter do u replace?? its a 4 stage
alex
Sediment, Carbon, and DI.
Did you test the TDS out of the RO membrane when it was new? If so check the performance again. If it's degraded you should replace it too or you'll go through the DI faster.