I am trying to get my pool ready for summer...I am a BBB follower. I have shocked it, added salt, got the chemicals balanced correctly, and have cleaned out the large debris. However; the pool is covered with fine gray powder (dead algae?). I have a sand filer that will not remove this stuff it just recycles it and makes the pool cloudy. I have tried adding small amounts of DE powder to the filter to help it get the finer particles, but no luck. It quickly slows down the filtration and then requires backwash. I have read about pool cleaners that have their own on-board filters, will these collect these fine particles? Does anyone have a recommendation or possible solutions? Thank you for any assistance.