SCENTED ENZYME TREATMENT: Citrus-scented Bio-Charge Replacement Cartridge for Evolution Septic Assist garbage disposals contains a natural microorganism that help break down food waste. Automatically dispensing when Septic Assist Disposal is on. LONG LASTING & SIMPLE INSTALL: Cartridge lasts 3 to 4 months with average use - equivalent to 4 bottles of other septic treatments. Install: turn the blue cap counter-clockwise until stem pops up, insert and lock in place, prime disposal 4 times. AMERICA'S #1 DISPOSER BRAND: There are more American-built InSinkErator garbage disposals in US homes than all other brands combined. A full line of models means there's one right for every need and budget. FASTER, CLEANER, SMARTER: From meal prep to cleanup, InSinkErator helps make it fast & easy to keep your kitchen clean with our iconic appliances: garbage disposals & instant hot water dispensers. A HISTORY OF INNOVATION FOR THE SINK: We invented garbage disposals in 1927, & we're the world’s largest manufacturer of garbage disposals & instant hot water dispensers for home & commercial use.