from Natural Chemistry
Great Price: $32.99
Sale Price: $24.99
Quickly reduces high phosphate levels
Phosfree Extra Strength is specifically designed for high level phosphate removal.
Free shipping over $50
Directions for use:
This product is designed for use in properly balanced pool water.
For DE & Cartridge Filters: Do not add more than 48oz (1.5L) at a time. If more than 48oz (1.5L) is needed to treat phosphate level, be sure to clean or backwash the filter between treatments.
Important: Retest water after each completed treatment. Repeat until phosphate level is below 100ppb.
NOTE: Algae must be treated prior to testing and treating phosphates. Chlorine must be under 5ppm before testing for phosphates.