HI guys, my tds wont drop below 26 after RO but before going into the resin. my tds is 280 from tap. before it was 13 so resin took it zero n I was changing resin once every 2 weeks. now its 26 before resin it means im changing resin every 2 days which is not practical in my eyes. naturally I thought my membranes were on their way out so I bought a new set but evan with new set its still 26. the old set I bought 9 month ago . I bought these membranes from pure freedom n never had a problem over last 3 years until this past 12 month where I seem to have bought set after set. any solutions??