Over the last 12 years no pool company I have hired has been able to keep my pool from going green. In exasperation I turned to the internet and found your site. I used some AquaCheck pool strips that the pool company kept in the pump room. Sure enough the Stabilizer reading was 300+. I am assuming this is basically a CYA reading and that the strips are somewhat accurate.
The pool company would not believe that this was the problem. So I drained the pool almost empty and refilled and brought the stabilizer reading to 30-50 per the strips. Thoroughly scrubbed and vacuumed the pool and cleaned the filter. Put some bleach in to bring FC reading to 5 and watched to see whether FC reading was different in the morning (it wasn't) and now have a lovely clear pool without the chemical taste it had. And sacked the pool company!
So while I wait for a proper test kit to be shipped to me (seems no one here sells anything other than Taylor K 2005) I have to do some guessing and need help.
The PH was high 8.4+ and the alkalinity high 180 ish. I put in a gallon (per pool math) of muriatic acid (20% Baume) which I bought at the hardware store. The ph has hardy gone down (maybe to 8+). I am encouraging the kids to splash around to aerate the pool but there has to be a better way ( I cannot get the jets to break the surface).
So I need advice as to whether to put another gallon of acid in to reduce ph? Any other help on what I have done so far would be appreciated. The last thing I wanted to do was add another chore to my life but I enjoy the pool so much I cannot bear to see it green again.