DRAIN KLEEN is a BACTERIA mixture containing biological nutrients & stimulants that CLEANS YOUR DRAIN LINES.
Mix one water soluble pouch in one gallon of water, them pour one quart in each drain, last thing at night. If drains are REALLY SLOW do this twice a week for two weeks, then once per week for two weeks. After this you may be able to treat the drains every two weeks. Only you can judge the grease and organic load on you drains.