BioGuard Algae All 60 is a highly effective algae preventative. It is recommended by the manufacturer for use with pools with attached spas or jetted returns. This product treats stubborn algae growths in chlorine or bromine pools. It is formulated to be non-foaming and non-staining. This product is effective on all types of algae and works in all pH ranges. Algae All 60 will not affect pH level.