I had a problem with calcium scale last year, but also had a problem with the glazing on my tile chipping so i decided to do an acid wash this year. I have a 20K gunite/plaster pool that is 4 years old.
I have a feeling the scaling was due to my high pH as the CH seemed to be fine - but no matter - I will get the water chemistry right when i fill it.
My question is this - I am acid washing with a 50/50 water/acid solution, and although the plaster looks very nice, I still feel the sharp - rough calcium. A pumice stone takes it off, but I don't really like the idea of rubbing the entire pool down.
I have already made 2 passes with acid wash. I am using a watering can - pouring it on, letting it sit for about 30 seconds and scrubbing and rinsing.... Should I up the concentration of acid? Any other thoughts?
I know I could do the no-drain method, but I don't have a heater bypass, and to put one in, I need to get some new union connectors for the filter and heater... just more work.
If this thread is in the wrong forum, feel free to move.