I recently moved into a house with 33k in-ground gunite / plaster pool. Pool is ~15 years old and still original plaster that's probably will need replacing soon. The house was vacant for close to 1 year and the pool maintenance wasn't really kept up. After fixing broken equipment and following directions from local pool supply store, I have the water very clean. There now looks to be black algae in all the areas where the plaster is thing or rough. So after reading up on everything here, I started the SLAM process 3 days ago. It's a SWG pool, so I have been using 28 to 31ppm as my FC level. After 24 hours my FC and TC levels were the same, and the last two nights FC has stayed the same. I have been brushing twice a day with stainless brush but the Algae is not getting any less.
So my question is should I keep the pool at SLAM FC levels for more time, Should I let the FC level fall to normal level, or should I let the FC fall to an elevated FC level (~10) and hold it there for more time.
Before I started.
Ph 7.2 <- Was 7.8 but lowered it before starting SLAM
FC been keeping to between 28 and 31
Thanks for any input.