Quote Originally Posted by ReefOne
My 6 stage i got from filterdirect is acting up. I've had it for 6 months and i've made probably 100 gallons tops and my tds went from 0 to now 10-14. Any idea what it could be. My reading in is around 45-560, it varies.
Does that system have a GAC cartridge AFTER to DI? If so, carefully consider why you would want that stage there. It surely will not further purify DI water - it will add tds. Don't expect 0 or 1 tds out of the final stage if its a GAC cartridge.