Hello, I have a fiberglass in-ground pool with about 27000 gallons I would say in it, PH level is fine, Chlorine level is low and the pool looks a light green color. I use a Hayward Microclean DE 6000 Filter and run it from 930 am to 430 pm, and wake up the next day and I see the yellow algae built up on the stairs and sides of the pool. The filter runs between 20-30 psi [the arrow keeps changing throughout the cleaning up and down]. What would I need to bring the pool back to a more normal state?
Also, I would like to buy a better test kit, anyone know of one?