This was our 30th opening. Never had a problem before this year. Opened to a green mess. Went to pool place had the water tested with the following result:
We purchased algaecide, several bags of pools shock Applied and in 2 days the pool was looking good. Only thing wrong is that we can't keep the clorine level up. We decided lower the CYa and do a SLAM. We pumped out water which we calculated to 10% which would reduce the the CYa to a more manageable 65. We got the pool test and now the CYa is 80! What can cause that. They said the phosphate was 200 which should be <125ppb. Haven't seen anything on TFP that mentions phosphates. So we still can't maintain the clorine level and don't want to do another pump out! Any suggestions appreciated.
Pool: 16 X 32 vinyl, 3ft shallow end to 8 ft deep end. I'm in MD.