Pro-Pump/SP (Septic Packets) provides a twelve month supply in a single box that contains twelve ready to use, two ounce water soluble packets. You just drop in your toilet and flush. Pro-Pump/SP is designed for home owners with large families and people with illness on medication. Add one Quart of Pro-Pump/HC to septic tank every six months. Then just drop one two ounce packet in your toilet each month to assure adequate biological action is maintained at all times in your septic system.