I have been doing BBB for a couple of months now, all of a sudden there is yellow stains around the return jets and on the sides of the pool where the water circulates. I don't have any vitamin C to check it yet but is it common to have this issue?
Is there something I should be doing regularly to help with this issue? How do I test for this issue?
I have not been perfect on keepign the chlorine consistent dailt, many times it gets down to 1 and I should be runnign at about 5-6 with CYA of about 50, but whenever I test for CC I get 0, does this mean this is not an algae problem?