I had just posted or thought I did a question,guess not. Anyway new here.
Inground pool owner for 12 years, plaster 20 k. Ok here goes. I have not had much luck with a bottom of balck algae. Not to much on the sides. I called a pro and wanted a price for a acid wash. WHoaaa!!! 1500.00 bucks, not today thank you. So I looked for alternatives knowing well that it might also etch the plaster badly but no alternative.
So, I have heard of using a citric acid with a full pool for two days and of course brushing the livin bejesus out of it. So I called another pro pool store and a few days later they called. I had left a message of my address and pool size etc etc. The person had google earthed my house and pool and looked at the size and type of pool.???
Anyway we talked about the pump brand ,filter brand and models, pool equipment and such. Waht we were looking for were metals that might get scarred by the acid he suggested. So this pool does not have but a light ring at the deep end and no ladders or other metals. The pump and filter passed the acid test with him.
One thing that I had learned was wash your de filter with degreasser before doing what he was telling me ,reason,,,, the oils embed from the muriatic acid into the filter and renders it useless in spots, he was suggesting after calculating gallons of pool and how much muriatic acid (15 gallons) to use while the pool will still be full with circulating at the same time. We also calculated how much baking soda (36 lbs)to have on hand to stop the muriatic acid process. The safety regs for us humans also.
I can ballance water with my eyes closed so not a problem with this pool. My question is has anyone ever heard of this being done?