Following the purchase of our home, I was hesitant to use a garbage disposal due to the septic tank but once the appliance sales representative explained the special features of the Evolution Septic Assist system I was sold. I have had other garbage disposals in the past with a septic system and always had an odor from the unit but not with the Bio Charge Bottle addition. I have enjoyed the quietness and assurance that the system is clean with no odor..