Can the algicidal material Ca-aminoclay be harmful when applied to a natural ecosystem? An assessment using microcosms

•The effects of using Ca-aminoclay to treat harmful algal blooms need to be understood.•Ca-aminoclay was found to be an effective and species-specific algicide.•Ca-aminoclay caused bacterioplankton abundances to rapidly increase.•Ca-aminoclay had a severe adverse impact on the environment. We assess...

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