Natural Chemistry 07200 PHOSfloc Pool Water Balancer, 4 Pounds Phosfloc reduces high phosphate levels to more manageable levels, inexpensively One bottle of phosfloc will reduce 4, 000ppb of phosphates to approximately 600ppb in a 10, 000-gallon pool Phosfloc must be vacuumed to waste or removed from the pool with a separate vacuum pump PH must be adjusted to 7.2 before applying Pool water balancer, 4 pounds