I got tired of looking at the cover on the pool, I could not stand it any longer, we had a very nice day last week so I decided to take the cover off. WOW it was crystal clear, yes it has dirt on the bottom but the water is GREAT. The FC was still at 15 but the PH was a bit on the low side 6.9 PH. So i got it filled up and started the pump and checked it the next morning and the PH was coming up. This is the best opening yet. Thanks TFP. Looking forward to a long swim season!!! Probably will start to heat her up in a couple of weeks.