I am struggling with an algae problem since we opened our pool this weekend. The chemicals are in balance, we have been shocking the heck out of the pool and scrubbing, vacuuming, cleaning the filter frequently, etc. Our CYA is only 40, PH is 7.4 and chlorine level is well over 5+ (It is probably more like 10-15). However, the water is STILL green. What is our next step? The pool stores aren't offering much in terms of advice. I just read about Phosphate Remover. Our phosphate level was 3. Would PhosFree or something similar be good to add to the shocking combination?