Is this a once a day thing? And do you take water out first then add the fresh SW?Couldn't live without it. That was one of my have to have things for this system. Not saying I’m getting old, but moving around lots of water buckets is not something I wanted to do at my age. Only down side is setting it up with the Apex doser. Pushing that much water, it runs at high speed and is quite loud. Even if I set it up to run at night, it would wake me up if I don’t keep the bedroom door closed. Fortunately after a career in jet fighters, my hearing is not the best so I’ve gotten used to it. If friends are over, I just turn it off for that day.