8.3.1 Control of algae

Algicides are used to reduce toxic or odorous algal blooms in water reservoirs. The chemical commonly used in the management of algal growth is copper sulfate. Before an algicide is used, the possible effects on aquatic biota, the accumulation of copper in sediments, the potential impacts on downstream treatment processes, and final treated water quality should be considered.

The use of copper as an algicide is controlled in some states. Information on the use of algicides should be obtained from the appropriate state or territory authority (see Section 8.9).