Forgive preese, if this question has already been raised. "Algaecide 60" seems to be trade name for what the Forum refers to as POLYQUAT, the Forum's preferred treatment. I bought some stuff at Sam's Club called "Algaecide 40" that I presumed would be simply a lesser concentration of same honorable formulation, however not so. Different chemistry altogether, clear, yellowish, easily poured, and with a nice evil smell to it... also, liquid volume of dosage would appear to be less than my experience with Polyquat.

Request any available informed opinion on this herbicidal imposter.

Merci beaucoup! Au Revoir!