We opened our pool almost three weeks ago and since it was such a warm March here, for the first time the water was disgusting black and had alot of algae growth. We have a 16 x 24 inground pool and have never really had issues other then chlorine off and a copper issue when we first moved here that was quickly solved. We opened it treated it and it was clear within a week however it continues to foam and has been for the last week.I have had to shock it due to some rain recently and am wondering even after cleaning the DE filter and having my water tested by my pool place, the only thing lacking is my chlorine levels. What is this foam that keeps coming when Im running the filter if my pool is clear and my levels are all good? This morning my chlorine was just barely registering but There is plenty in there right now so what do I do with this foam? Is it safe how do I get rid of it?