Get 3-in-1 . clog-fighting action with Liquid-Plumr Full Clog Destroyer. It cuts through standing water to clear fully-blocked drains . prevents clogs with regular monthly use and protects pipes. This powerful system removes hair . gunk . grease and soap scum whether you have a total blockage or a slow-running drain . while Pipeguard prevents pipes from being damaged as the clog dissolves. It works in the bathtub . shower . bathroom sink . kitchen sink and garbage disposal . and when used monthly prevents buildup and stops clogs from forming. This drain cleaner is safe for all septic systems . garbage disposals and pipes . including PVC . plastic . metal and old pipes. Do not use with a plunger . in toilets or with ammonia . toilet bowl cleaners . or non-Liquid-Plumr clog removers (to avoid hazardous gas). It contains biodegradable surfactants and no phosphorous. Excessive heat or cold may cause Liquid-Plumr to form clumps . but this should not affect performance.