I have a 10,000 gallon above ground vinyl pool with a saltwater system that I have treated for high phosphates for two or three years now even though I have never had algae problems. Phosphate levels are tested at Leslie's Pools. I have read some messages on this website regarding the use of PhosFree and now I wonder if I should be using it. I am getting ready to open my pool for the season and I always buy the opening kit from Leslie's that includes the PhosFree product.

After treating with PhosFree the levels go down, but then will gradually go back up. Do I need to be using it or something else?

This is going to be my sixth or seventh year with the pool and the problems didn't start until two or three years ago.