i've tried the sweet leaf and turbinado sugar. they both start to form a film in the water after a couple days. i fill and mix a 2 gallon jug and use it for a bout 5 - 6 days. by day 3 it's getting cloudy. the black strap molasses is the only thing that hasn't gummed up "yet". i am in SOIL. i have never tried syrup. probably to processed.