This product is very fine, almost like a dust, so you have to spread it on a COMPLETLY calm day, or it will blow around everywhere. With that said, it also works extremely well on killing algae. We have had a big algae bloom this year on area ponds, more so than I have seen in a long time. I walk around the shore of my pond with a small pail of it and simply cast it out with a nitrile gloved hand while wearing a dust mask. You don't have to put it out heavily either, just a light dusting and that nasty geen stuff is turning brown within an hour or so. This type of copper sufate is actually made to add to livestock feed as a trace mineral for the animal, that's why it so dang fine. But boy, what a bargain price for the 50 pound bag! It will go a very long way, I won't use all of it this year and will have plenty left for using it if I need it next year. Just keep the unused portion it it's bag in a 5 gallon plastic bucket with the lid on it, out of the way of children and pets.
