Natural Chemistry

Natural Chemistry Phosfree Extra Strength 1L

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Phosfree Extra Strength​ is specifically designed for high-level phosphate removal.


  1. Clean or backwash filter. Make sure DE filters are properly cleaned and charged with DE before adding the product.
  2. For phosphate levels over 1000ppb, add 32oz (1L) per 10,000 gallons. DO NOT add more than 48oz. (1.5L) at a time.
  3. Shake the bottle well before application. With the circulation pump running, add the recommended dose to the skimmer.
  4. Some clouding may occur. Run the pump and filter for 48 hours continuously without backwashing or cleaning the filter.
  5. After 48 hours, vacuum to filter.
  6. Backwash or clean filter.
  7. Retest the phosphate level. Repeat steps 1-6 if necessary.

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 the phosphate level, be sure to clean or backwash the filter between treatments.

Important:​ Retest water after each completed treatment. Repeat until the phosphate level is below 100 ppb.