like title says i have an ionic system n dont really feel need to check water but just did coz been a while n its reading 009 n 011ppm, my di filter looks a little brownish in colour (not fully) iv just did a pure water (purish) flush for 20mins and now im backwashing will this be enough to reduce it down or should i just order a new di filter tmoz, anyhting else i can do to reduce it??