It sounds like the the 'green' is gone, but the pool is remaining cloudy?

A very common cause of this problem is the oversized pump + undersized filter combination typical of AG pool packages. What happens is that the big pump forces the dirt (dead algae) THROUGH the little filter, AND also washes the sand out during backwashes.

Do the "DE-test" on your filter to make sure it's actually working OK. If it is continued use of DE in a sand filter will help capture and filter out the fine particles causing the cloudiness . . . at the price of more frequent backwashing. http://pool9.net/de-test/