 right into your hot tub and follow the instructions to purge your hot tub. So there's no more teaspoons and measuring things out. You just open the package, push it out into the tub, you're good to go. We sell those singly, so just you can buy them one at a time, and we also sell them in a great four-pack, which is a much better value. In addition, we also now sell the same awesome gel in a tube, which is great. Easy application, easy to store. It prevents waste.