Same here, I'm not sure exactly how it works but do think it does take some time to work and maybe a couple of treatments.
I managed to stay pretty clean. The only mess was after the pump ran out of gas and I had to restart it. The stuff clogged up the hose and took a while to get out. Came out on the bank and made a mess. Took a while to wash it off the bank and that was the only time I really saw the product in the water. I expected to see the product mix with the water but was surprised that I really couldn't see it. The pump must have done a real good job mixing it. Judging by the amount of floc, I don't expect to see results until after a couple of treatments.
