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Heloxy 107 is a multi-constituent substance. Aquatic toxicity tests featured analytical confirmation of dose with respect to the two predominant constituents, with good to excellent maintainence of concentrations. Results were expressed in terms of nominal concentrations of test material. Algae were the more sensitive species. The 72-hour EC50 (growth rate) of Heloxy 107 to Pseudokirchneriella subcapitata was 38 mg/L, while the EC10 (growth rate) was 18 mg/L (OECD 201). The 48-hr EC50 (immobilization) to Daphnia magna was 71 mg/L (OECD 202).