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The other huge issue is that dirt and pollen continually fall into a pool from the air or from a screened enclosure when it rains. This dirt and pollen will adhere to the balls, and over time they will become a breeding ground for algae.

Thank you for the clarification! That makes me feel better about using it if my numbers on phosphates get too high. Currently, my phosphates are 150ppb. I think I'm OK for a while.

My concern over the use of most phosphate removers is the active ingredient—the substance that actually works on the phosphates—called lanthanum. It’s a soft metal element that’s classified as a rare earth element despite the fact that it’s almost three times more abundant than lead. Lanthanum...