The BM-T11 is a great option for calcium and alkalinity supplementation, additive dosing, or even food dosing. It’s Bubble Magus’ most advanced pump to date, featuring a stylish new body color and form factor, expandable up to 11 channels with the BM-T12 Slave Unit, tighter tolerances on seams to resist moisture exposure, and an advanced alarm system for motor and tubing issues.