Zeovit Cyanoclean reviews?

[Northvan]

Anyone tried this product yet? Its meant to be used in conjunction with Coral Snow to treat cyanobacteria.
We have done a couple treatments with Chemiclean, which has worked in the past, but not anymore. I think its become resistant.
The Zeovit cyanoclean is pricey, about $80.00, so I'm hoping for feedback before dropping the dough.