This year we purchased a home with an inground pool. Last year I maintained our above ground pool using the TFP method with great success. When I opened this pool, there was green algae and CYA over 100. I reduced the CYA to 80 and performed a slam. As the year has progressed, I notice I am adding one to two gallons of 8.25% or 10% chlorine every day in the inground pool and two gallons per week in the above ground pool I am still maintaining at our now rental property. looking back, I believe I never properly completed the initial slam.
After hurricane Hermine, the liner developed a huge air bubble which I walked out the steps and then worked the liner back in place best we could. After that, yellow algae began to grow on the walls so I started another slam. I had gotten the CYA down to 60 before the storm and it was at 40 after the storm. I have been slamming now for over a week and the water is clear with 1 ppm CC. I still have a black dusting when I brush.
I have been maintaining my chlorine at 7 to 10 all year. During my last slam I have kept the chlorine between 10 and 30. Mostly 30 at night drifting down to 10 by the time I get home. I lost two ppm last night going from 12 to 10. I had let the chlorine drift down yesterday thinking I was done.
I guess I will continue to slam at high levels as around 30 seems to be the only thing that will dent this stuff.
Looking for any added help...