Hi:

My pool data is as follows:

FC: 10
pH: 7.2
TK: 80
CYA: 30-50
Water temp: 63 oF

It seems that everything is OK except the Chlorine level did not get back to OK level. I have shocked and kept the FC level above 10 until Sunday a week ago. I covered the pool since it was rainy the whole week. When I tested the water Saturday, the pool data is similar to the data I got today. It has been sunny since then. I am wondering when the chlorine level will be back to OK. Should I turn on the pool heater? Will that increase the speed that the chlorine to vaporize or gone? Should I add something to lower the cholorine level? Please advise.

Thanks