I would definitely be adding bleach! You don't want an algae bloom. Phosphates really are only a problem in very few pools but your levels are very high and it might be worth it to try and see if it works. If you have a cartridge filter you can't use the flocs....you will have to treat with the lanthanum chloride based producets. They will clould the water and cause the filter pressure to keep rising...keep an eye on it and clean the filter whenever necessary. This is what removes the phosphates. If you cannot floc it might take multiple treatments to get the phosphate levels down. I personally have never seen a case of phosphates fouling a salt cell but I have heard that it can happen.