Are you in the United States? ...

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Are you in the United States?  If so, remediation of algae requires a licence to do so.  I have been licensed for 37 years in that field.  There are national organizations and regional meetings that address this.  The penality for doing this work without a license includes jail time and heavy fines.   That work for us is now a division of the company I own, which freed me up for more chemical work.