First I want to say, I'm new to the pool thing and TFP has been fantastic!
I bought a house a few months ago with a freshly redone pool (Dec) and the pool has been relatively pain free. At first I thought we had aggregate pool but the more I read, the more I think we have a poorly finished plaster pool. We started with a pool guy that never showed so I gradually started to learn and now I'm taking care of it. I vacuum twice a week, brush 1-2 times a week, clean the filter twice a month, and run the filter 10 hours a day. A few weeks ago I noticed a few spots of black algae (7 spots) in some divots on the stairs so I dove under, scrubbed and scrubbed along with added 2.5 gallons of chlorine, per the pool store. They went away but now I'm seeing more and more spots, about 20-30 in the shallow end and want to take care of it.
My readings are below but the pool place said to just dump copper based black algae treatment in but from reading here, it seems I should bump my FC to 39, based on my CYA level. I've read I should brush numerous times a day, especially on the algae, and continuously test to maintain FC levels. I went to the pool store to get more liquid and they thought I was crazy so I'm thinking maybe I misread. I read threads that said the pool store was going to disagree but they really have me worried. I bought a metal pool brush but I'm holding off on adding Chlorine until I hear I'm correct or incorrect. The copper based treatment isn't real expensive but I hear it stains and such.
14-15k gallon Chlorine Pool
TC - 4 PPM
FC - 4 PPM
Alkalinity -130 PPM
Calcium Hardness - 260 PPM
Stabilizer/CYA I believe - 100 PPM
Total Dissolved SOids - 1,100 PPM
I dump 1.5 to 2 cups of acid in a week to control pH, which they say is normal here, especially with a freshly done pool.
They wanted my stabilizer higher so I have floated 1-2 tablets a week.
Usually they say about 1.5 cups of acid but this week they are telling me 2.9 quarts, which seems high but maybe alkalinity?
Sorry, I know I'm being a noob and all this information is in the forum, which I have read but the store pretty much told me this was a terribly dangerous idea.