Welcome to The PoolForum!

It sounds like you have yellow/mustard algae. Does the algae grow mostly on the shady side of the pool?

How are you getting your pool water chemistry numbers? What test kit (brand/model; drop-based or test strips) are you using or are these numbers from a pool store?

Tell us more about the type of pool you have. In-ground vs. above-ground. Plaster, vinyl, fiberglass pool surface. Size in gallons. Number of returns and whether you have a floor drain or pop-ups, etc. Size of pump. Type of filter (sand, cartridge, DE).