Hey chaps, I was wondering what people's thoughts are on how often you should flush your RO and if anyone has a softener installed how often they backwash it. I have a 350l tank with a HF4 4040 and softener and been told to flush the RO once a week for 15 mins and backwash the softener with regeneration salt once a week for 15 mins. Would this be sufficient if I was using a tank per day? [hr] Just to add as I was asked on another thread. My TDS out the tap is 275. I'm getting a reading of 25 after RO and before DI without the booster pump. With that goes down to 6. That sounds good to me, if someone can confirm this?