Bubble Magus BM-T11 is a fully programmable, 3-channel dosing pump set that has been designed for the automated supply of calcium, magnesium, alkalinity, and other elements to reef and marine aquariums. This can also be used for feeding fish and invertebrates too. Can be extended up to 11 channels and is also recommended for use on freshwater aquascapes and other set ups. A full range of accessories are available.