For the last few weeks I have been battling an algae problem. My test numbers have been good and I've been keeping up with my chlorine. I will say my pool does not get used a lot so the only "circulation" it gets is from the pump/filter. Could this "stagnation" be the cause of my algae problem? Here's my most recent numbers-FC 4, CC 0, TA 120, CYA 40, and pH 7.3. I have already had to floc and vacuum twice in the last 5 weeks.