I can sense that you're really frustrated with this, and believe me, I understand why. We ARE trying to help!!

Is your filter capturing any of this stuff? How fast is your pressure rising and how often are you backwashing it? Have you tried the "adding DE to your sand filter" trick?

This is just an afterthought, but have you added any Baquacil, Soft Swim, Pristine Blue, or other PHMB chemicals to the pool? What did you add to it when you closed it before the winter?

Janet