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Natural Chemistry Spa PHOSfree contains revolutionary technology specificially engineered for spas and hot tubs. When added to your spa or hot tub skimmer, a thin coating of PHOSfree forms on the filter media and as water flows through the filter, phosphates are reduced to near zero levels. Adding Spa PHOSfree at start-up and on a weekly basis reduces and maintains phosphate levels to near zero.
16 fl oz per 400 gallons of water.
1 fl oz per 100 gallons of water per week.
Add 16 fl oz (4 large capfuls) per 400 gallons directly to spa water with filter operating. Temporary turbidity may be experienced with new spa Start-Up.
Add 1 fl oz per 100 gallons weekly.