We have been dealing with some kind of staining since we opened the pool this spring.

In ten years, this is the first time we have had any problem like this. By the time I realized it was some kind of algae, it had spread all over the deep end floor and a lot of the wall areas. The water was pretty much crystal blue the whole time.

Since finding the forum, I have discontinue tabs and started using the BBB method.

I have had my chlorine up over 10 ppm for about one week and now when I brush the pool surface the bristles of the brush are covered in a brownish sticky tar like residue and the pool is finally starting to slowly clear up. I have also been adding super algaecide every day also.

Before getting the chlorine level up when I brushed I never got an residue on the brush.

What kind of algae acts like this and do you think I have finally turned the corner on this?



16 x 32 inground 20,000 gallon
PH 7.2
TA 160
FC 11.5