Without a current flow it dosent work nearly as well. Not to say it wouldn't work at all, but current is key for getting a good chum slick going, which fish follow back to the boat/chum source. It can also get pricey, as 4 to 6 of that size depending on current, would be required for a 4 hour trip, assuming your using just 1 chum bag. Never seen or heard of it being used in fresh water, and not even widely used in salt water, except in the keys.