InSinkErator CG Evolution Septic Assist Bio Charge Replacement Cartridge, 16-Ounces, Blue Features 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. USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.