i read it on the label too, the fact that the gly can be more effective with the addition of am sulf. this was on several different brands. i asked for some at an ag store and they just scratched their heads. i looked in several hardware stores too, couldn' t find any.

i went to a yuppie nursery/greenhouse/fancy home and garden center, and they had it. it was $3 for a 5lb bag.

make sure you dissolve it in a separate container. it has about 2% non-disolvable matter in it, like rocks and bits of organic things. i spray in small quantities, so i put about 6 oz in a big glass then add hot water, then i pour it back and forth in and out of another glass. pretty soon the crystals will dissolve. this is when you pour it through a fine mesh strainer. the strainer will catch all the organic crap and the rocks and sand will stay at the bottom of the glass.