Perfect for “2-part” alkalinity/calcium (and magnesium!) supplements, this dosing pump delivers a slow, consistent flow of approximately 1.5 ml/minute (about 1 drop every 3 seconds) for delivery of water quality amendments (e.g., calcium, magnesium, alkalinity, chlorine). The pump is powered by 110 vAC current, so you can plug it directly into a wall outlet, or into an appliance timer. Four-roller, silent pump will not back siphon. Control the amount of chemical dosed by the length of time the pump is powered per day. Includes 10 feet of tubing and a graduated cylinder for purposes of measuring the dose supplied by the pump. 1 year warranty on pump (excludes tubing).