Melba, I recently had a phosphate level almost off the charts (2500). I had no algae breakout so I was lucky. I used a product called "PhosFree" by Natural Chemistry. With my phosphate level so high, I had to use 3 large bottles (3liter each) to remove the phosphates. All you do is put it in your skimmer and run the pump. The pressure on your filter my go up. Mine did but then it went back down. After a few days, I backwashed and repeated the process. Took me about 2 weeks. If your phosphate level is 800, you may only need 1 bottle. Depends on the size of the pool. It will not harm your pool. It will make it look "milky" for a while but that clears up in a day or so (Phosfree looks like milk). Anyway, it worked for me.

Hope this helps.

Mike