I have black algae growing on my pebble tec and the tile and the white floats connected to my pool sweep.
My readings are TC 9.5ppm
Water is clear, no smell. I initially had it in a few spots. I put black algae killer in it over a month and scrubbed the 10 spots i could see it for over hour off and on. I thought it was gone but now I'm noticing it all over probably 200 spots all over. Too much to scrub off. I'm thinking I need to drain pool and have someone come in with acid and scrub off. Help