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The most frequently encountered species of algae found in swimming pools in the Phoenix metropolitan area were used to evaluate the laboratory effectiveness of five commercially available pool chemicals used for algal control. The pool algae used were the xanthophytePleurochloris pyrenoidosa , the chlorophyteOocystis sp., and the cyanophytesPhormidium minnesotense andPlectonema sp. Pad Algae Kill (a chlorine derivative) was effective in the control of all test organisms. Algaedyn, a silver-containing algicide, was effective onP. minnesotense andPlectonema sp., but caused only a slight inhibition in the growth ofP. pyrenoidosa andOocystis sp. Quarternary ammonium (Padicide) was more effective in controlling the growth ofPhormidium andPlectonema thanPleurochloris andOocystis. Algimycin (herbicide) only reduced the growth ofOocystis and was ineffective on the other species. Bio-Gard (copper) reduced the growth ofPleurochloris , but had no effect on the other test organisms. The technique used to quantify the influence of algicides on isolated pool algae appears to be adaptable to those algae that form distinct colonies on an agar substratum.

Laboratory Comparison of the Effectiveness of Several Algicides on Isolated Swimming Pool Algae