what is this stuff algae or not
Not sure if it is mustard algae or not, kind of looks like sand its in the deep end corners and incline of the pool, cant vacuum it, it settles right back. Thiis is the second season with, someone told us it is mustard algae, I'm beginning to think not! please help, coudl it be a chemical imbalance???? : I want to cry

Not sure if it is mustard algae or not, kind of looks like sand its in the deep end corners and incline of the pool, cant vacuum it, it settles right back. Thiis is the second season with, someone told us it is mustard algae, I'm beginning to think not! please help, coudl it be a chemical imbalance???? : I want to cry

