I've had my pool for two years now. I've read thru the pool school a few times now. I have the TFP recommended test kit. Here's my question. I test for FC daily. Normally when kids are finished swimming around 7ish in evening during summers. Pool school says its normal to have to add 2-3 ppm of chlorine daily. This is also normal for me. (I use bleach) My pool water is always clean and clear. My wife sometimes teases me that I like the pool more then her as I'm spending so much time taking care of it. But I have fun taking care of the pool. Anyways, when ever we leave for a few days in a row and we come back the pool is always starting to turn green. I always make sure everything is tested and where it should be before we leave. The filter is on timer, so that's good. What am I doing wrong that this happens? Surely people with pools can leave their pools for a few days without worrying about it turning green. Please advise.