The Aquamedic Kalkwasser Reactor is a unique stirrer. Kalkwasser is one of the easiest methods to supplement calcium and alkalinity, and using a kalkwasser reactor makes it even easier. The Aquamedic Kalk Reactor can handle very low flow as the stirrer mechanism is not driven by water pressure or stand-alone mixing pump. The electric motor keeps the mixing of kalkwasser very consistent with low flow top off pumps. Foot Print: 6.5″ x 6.5″ x 18.25″Media Chamber Dimensions: 4″ x 15″Volume: 0.8 GallonsHose Connections: 1/4″ inlet x 1/2″ outletMedia Capacity 150 grams. Aqua Medic Kalkwasser Stirrers feature a bar that slowly spins continuously to keep the kalkwasser saturated at the right level. At slow flow rates it does not create the heavy kalk slurry common with competing brands. This simple feature eliminates much of the overdose risk.Many of the other kalkwasser reactors available use a mixing pump to vigorously mix the kalkwasser at periodic junctions. This creates a highly-concentrated slurry of kalkwasser that cannot be dosed until it has settled out. To protect against this danger, these types of reactors require a complicated series of timers to control pump operation.