Phosfree® Instructions

Directions for use:

This product is designed for use in properly balanced pool water.

  1. Clean or backwash filter.
  2. Determine appropriate dose. * See chart below.
  3. Shake bottle well prior to application. With circulation pump running, add dose to skimmer.
  4. Run filter for 48 hours continuously without backwashing or cleaning.
  5. After 48 hours of filtering, clean/backwash filter. Retest phosphate levels, and if necessary, repeat steps 1-5.

Note: If DE filter pressure rises to 10psi above start-up pressure, turn pump off for 1 minute and then turn it back on. If pressure remains high, backwash or rinse for 30 seconds.

Dosage Chart

Dose per 10,000 gallons (38,000L)

Phosphate LevelPHOSfree Dosage
300ppb or less0.5L or 16oz
600ppb1L or 32oz
900ppb 1.5L or 48oz
1200ppb 2L or 67.6oz

For DE & Cartridge Filters: Do not add more than 1.5L (48oz) at a time. If more than 1.5L (48oz) is needed to treat, be sure to clean or backwash the filter between treatments.

Important: Algae must be treated prior to testing and lowering phosphates. Chlorine must be under 5ppm before testing phosphates.