Little background I have been cleaning a few outdoor pools for a resort for a few years now. I have had no problems maintaining the water. But I have recently started cleaning cabins and I have been giving all the cabins with indoor pools. 1 is a salt water pool 1 is bromine pool other 3 are chlorine tabs. I use Taylor fas dpd 2006k test kit. So my main problem is high cya. I having a hard time finding a balance for chlorine. These pools are 2500 to 3500 gallons. I try to maintain my chlorine at 3ppm. But I'm finding that it's hard to maintain this level. I can turn the chlorinator on a 1 and it will be fine but then guest can check in and over use the pool and I come to clean it and have cloudy water. I turn it up to a 3 for next guest I come to clean it and may have a 6 or higher ppm. Then cabin may not rent for a few days and chlorine might get to 10 plus. I then turn it off to barely having it cracked open, only for next set of guest to use it a lot and bottom my chlorine back out. So not sure how find a proper balance with such small pool and not knowing how busy the pool is going to be. Now I have started to check my cya levels again and I'm in the 80 to 140 ppm range on the chlorine pools. This happening cause of how often I half to boost my chlorine. I'm using 3 inch trichloro tabs. One pool had some calhypo 3 inch tabs but doesn't have the right feeder and the hardness is 560. So how can I keep my cya levels from getting so high. These indoor pools get no sun light at all.