The new LiterMeter III™ is an automatic precision dosing pump for the aquarium and horticulture industry. Three independent programs control one built-in pump and up to two external pumps. Perform 2-way water changes, in addition to eliminating the manual drudgery of dosing Kalkwasser, trace elements, or topping off evaporated water. Quiet operation, auto-calibration, and virtually maintenance-free. The new aquarium dosing pump is made out of precision-machined aluminum fabricated to exacting aerospace tolerances. For example, such critical tolerances as the rollers are machined to +/-0.0005". The outer surface is polished to a mirror finish. Internal surfaces are held to a 63 micro inch finish and hard anodized to provide a durable and low-friction raceway. The pump's planetary direct drive is at an 11:1 ratio, thus providing enough torque to generate over 40 pounds of pressure. This incredible lift enables the LiterMeter III™ to pump over 60 feet above itself at a flow rate of over 250 ml/min. It can also draw up from 25 feet below. The motor in the LiterMeter III™ is made by a manufacturer of precision high reliability motors made to our specifications as a peristaltic drive motor. The pump is so reliable we now offer a five year limited warranty. Calcium maintenance and alkalinity control are essential for a healthy reef tank. SpectraPure's LiterMeter III™ eliminates the manual drudgery of dosing Kalkwasser, trace elements, or topping off evaporated water. Kalkwasser replenishment, to be most effective, should be added to your aquarium slowly and consistently to avoid precipitation of calcium carbonate. The LiterMeter III™ automatically and reliably performs this task for you. Features: * Absolutely the Quietest pump on the market; excellent for reef tanks * Now includes a 5 Year Limited Warranty! * One internal pump provided with unit, remote pumps optional * Fully automatic pump operation - Set it and forget it * Precision Dosing calibration feature eliminates guess work * Dependable and virtually maintenance free * Self-priming and Anti-siphoning * Compact size and cool operation * Precision dosing system can be powered directly from a 12VDC battery * Highest quality precision dosing system - incomparable accuracy