Got back Sunday from a long weekend to a cloudy green pool. Tested FC, was 0. It had been running 5-6. Using my last cya I added enough 6.5 jugs of 8.25% bleach. That should have brought it up to an FC of 31 but, another test 30 minutes later showed a level of 1. Added my last 2 jugs, put my swg on super chlorinate and went to bed. Tested this morning and found a FC level of 1 and a CC of 4. Out of bleach so added a pound of shock I keep on hand to sterilize my travel trailer potable water system. Today bought more shock and bleach. Came home this evening and found a clear pool but a bunch of dead alge on the bottom. Tested FC this evening, it was 0 again.
I tested my cya level and also found it to be 0. Last tested my cya level on June 16, it was a solid 80. What happened to it? There has been no bad rains in my area and a salt level test is the same now as it was on June 16th, a solid 3400, so dilution is not the reason.