Chlorine based no-rinse sanitizer. Yeah, I know, it says rinse well on the side, and you are welcomed to. But it boils down
to packaging laws at the state level. Without getting into it (call me if you really want to know) suffice to say, you can drain
and air dry....or rinse, it's entirely up to you. Use 2 oz. per 2.5 gallons water to sanitize all fermenters, tubing etc.