Dosing Pump for freshwater or marine. This unique vacuum pump is designed to pump water up to 30" at a flow rate of 3 1/2 gallons per hour. Powerful and durable function allows for many applications such as trace element dosing, drip system for reptiles terrariums, circulating pump for lizards, amphibians and for priming gravity fed siphon tubes. It is recommended to use Suction Pre-Filter with Aqua Lifter-Dosing Pump so clogging does not occur. Suction Pre-Filter removes large particles before they enter Aqua Lifter.