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High pH can be harmful to your fish as well as your aquatic plants. PondCare pH down SLOWLY adjusts the pH of the pond water without harming delicate pond fish or pond plants. Phosphate free and will not promote algae growth. Amount treated depends on the degree of change in pH required. 16oz
Add one oz per 300 gallons of pond water per treatment. Test water in 24 hours and repeat as necessary.