I love Pyrex crystals, they are cost effective, and smell amazing. My husband works in a tool and die shop, his clothes have always smelled like the coolant they use. Pyrex crystals gets the smell out, and helps them to stay fresh. I really wish they would come in a refill bag, between me and my two college age daughters we go through a lot of it, plus I hate wasting all the plastic bottles. It would even work to put it in a gallon tub, with a scoop.