Hi, welcome to TFP! Could you please post a current set of test results? It looks like you may have some algae trying to establish itself in your pool, and your test results will help us troubleshoot the problem. Do you have a lot of trees in the area?
Also, please update your profile signature with the following information: type of pool (in ground or above ground), pool surface material (fiberglass, plaster, vinyl liner), pump horsepower and brand, filter size, brand, and type (sand, DE, cartridge), fill water source (city or well water), and any additional features the pool has (waterfall, deckjets, spa blowers, in floor cleaning system, ect).
