The Calciumreactor KR 400 supplies dissolved calcium and calcium bicarbonate ions to reef aquaria up to 100 gal. It is a sealed system operating at a very low flow rate. The filter can be installed in almost any position, inside or outside the aquarium or the cabinet. To provide the water flow, we recommend our SP 1500 dosing pump. The reactor is filled with hydrocarbonate – a pure form of calcium carbonate with an extremely low phosphate level. The reactor is already equipped to accept our specific pressurised electrode.