Not sure why need to use this product, as can kill all the beneficial bacteria as well.
Better find the root cause of cyno outbreaks, mostly phosphates.
Use GAC more extensively, cut down light usage on the tank, cut down additives, suck the cyno out, less feeding, more frequent water change, better husbandry....
Putting more snake oil in the tank might solve one problem but create others... well, that's my opinion...