Bought this over a year ago along with theG.T. Water Products, Inc. 157 10-Foot Drain King Hose and Brass Faucet Kit. It sat in the bathroom closet until we used the last of theJelmar PP4-5 CLR Power Plumber 4.5 oz.. Busted out the Drain King tonight after the bathroom sink clogged completely. Cleated the clog within 30 seconds or so. Faster and more effective (as well as greener) than throw-away compressed air cans!