Deltec Kalkwasser Stirrer Supplies continuous saturated solution of limewater/kalkwasser, Ideal for use with calcium reactors, Helps to maintain calcium, alkalinity and pH, Aids in the precipitation of phosphate KM500Aquariums size up to 400 gallons, Dimensions (LXWXH) 5 x 7.5 x 19 inches, Power consumption 7.5V/3 watts, Produces up to 1.3 gallons of kalkwasser per hour, Can be used inside or outside a sump KM500sAquariums size up to 1800 gallons, Dimensions (LXWXH) 8.7 x 8.7 x 19 inches, Power consumption 7.5V/3 watts, Produces up to 2.6 gallons of kalkwasser per hour, Can be use inside or outside a sump KM800Aquariums size up to 10000 gallons, Dimensions (LXWXH) 15.8 x 15.8 x 31.5 inches, Body diameter 12 inches, Power consumption 7.5V/3 watts, Produces up to 7.5 gallons of kalkwasser per hour, Can be used inside or outside a sump