Can't see what exact ingredients are, but most likely it is a flocculant. We use them in our water treatment facility where I work. They make fine suspended solids clump together so they can either settle out or get caught in your filter foam. It won't take out very much cloudiness from one celled biological life. ie. a bacterial bloom. The stuff you have is very handy in clearing silt of other very fine non-organic materials that get in your water from plant substrates and dirt from sand and gravels not completely rinsed.
Hope this helps. OS.