For 8 years, we have had our in-ground 10,000 gallon plaster pool and live in Waikoloa on the Big Island of Hawaii (DE Filter with 1 HP pump/60 gallons per minute). Last May, we painted it with Insl-X paint and we now are fighting green algae. . .we have never had this problem before.
Before we painted it, we used trichlor (FC 3-5) and one cup of acid a week to keep the PH at 7.4 and we fought a little yellow algae in the warm summer months. (Ran the pool about 2 hours a day. . .vacuumed once a week and had to super chlorinate once or twice a month with Cal Hyp but the pool had nice clear water all the time and it was a pleasure to take care of)
Now after painting the pool in May, our pool numbers that I know are:
We have tried trichlor, bleach and cal hyp and nothing can beat the green algae growing on some of the walls and bottom. The pool water is a bit hazy all the time unless we constantly run the filter. We have not had to add acid for 4 months according to the test kit (but our TA is really low) and when I use the pool calculator, it says we need to add over 4 lbs of baking soda which we do not feel comfortable doing.
We super chlorinate then vacuum the pool on Sunday but by Wednesday, the algae is growing on the bottom and walls and the water is a bit hazy. Any suggestions on where to start?