over a week my pool went from sparking clear to increasingly hazy. then I started to see green algea on the bottom. I have been diligent on keeping my levels correct. (FC between 2 and 6)
Last nights test
pool calc said shock level is 16 and to add 160 oz of 12% shock. that took me to 21 and held it for two hours, CC still tested at 0.0. I could not retest till this evening due to work but I ran the filter for 24 hours. this evening the water looks much better but still some green stuff on the bottom.
Tonights test. shows FC at 9.0 and CC 0.0 PH held at 7.5.
What I dont understand is the CC being zero.
also I was only running the filter for 8 hours a day and had not backwashed for about 3 weeks since the flow was still good.
I have many friends and family in the area with pools and they do not have the frequent problems I do. They keep the PH right and add chlorine Nightly. The difference is they all have DE filters and I am running sand.