I'm new to the site and I'm very grateful that I found it.
I have a 39,000 gal in-ground pool that has some sort of foam bubbles on the top. When I opened it a few weeks ago, I used some algaecide (recommended by pool store) and I believe that was the cause of the foam. However, it's been 3 weeks and it won't go away. If I stop the pump, it slowly disappears, but then shows up again once I start the pump. I've cleaned my filter (power wash only) multiple times as well as vacuumed the pool while flushing the water out to the sewer. We've also had a bunch of rain as well as adding my own fresh water hoping it would dilute whatever is causing the bubbles. But nothing is working.
Here's a photo of what it looks like.
The water is crystal clear and the tests are fine except for the free chlorine and the combined chlorine. The free chlorine is 1.0 and the combined is 10.
The pool store recommended using either 45 pounds of Shock or 3 buckets (not sure the amount) of Flocculant. He said the Floc would sink everything to the bottom and lower the combined chlorine to a more acceptable level. I never heard of Floc being used for that. Has anyone else? I also purchased some anti-foaming liquid (haven't used it yet) and I even have a new filter coming in two days just in case whatever is causing the foam is stuck in my filter.
Does anyone have any recommendations? Would the foam be sticking around because the free chlorine level is too low? Would you recommend Shock, Flocculant, or even many bottles of bleach?
Thanks for the great site.