SANI STICKS™ KEEP DRAIN PIPES CLEAN and CLEAR ALL YEAR! Just one enzyme stick a month is enough to break down and digest organic and grease build-up in drain pipes. Keeps sinks and tubs clog-and odor-free! Sticks are biodegradable and earth-friendly. You get a set of 24—enough to keep 2 household drains clog-free for a year!