Bio-Charge Evolution Septic Assist They don't dominate a kitchen like a massive refrigerator. They don't feature elaborate control panels like a microwave oven. But InSinkErator food waste disposers take their rightful place of honor in kitchens around the world. Day after day, perhaps more often than any other appliance, they bring convenience and practicality to everyone in the home. Fits Septic Disposer Lasts 3 to 4 months with average use. Bio-Charge(R) cartridge equals 4 bottles of other septic treatments. Bio-Charge(R) contains a citrus scent to help control odors from the sink and drain. Surfactant to help break down soap and grease film that accumulates in drainpipes.