Phosfree Extra Strength is specifically designed for high level phosphate removal.
Directions:
- Clean or backwash filter. Make sure DE filters are properly cleaned and charged with DE before adding product.
- For phosphate levels over 1000ppb, add 32oz (1L) per 10,000 gallons. DO NOT add more than 48oz. (1.5L) at a time.
- Shake bottle well prior to application. With circulation pump running, add the recommended dose to skimmer.
- Some clouding may occur. Run the pump and filter for 48 hours continuously without backwashing or cleaning the filter.
- After 48 hours, vacuum to filter.
- Backwash or clean filter.
- 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 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.