Maxi-Jet®PH pump and power head is ideal for powering undergravel filters or creating internal water movement from its fully rotational output. This pump incorporates a venturi aeration device to provide optimal aeration and gas exchange in the aquarium. A silencer keeps the venturi aeration device operating quietly. An adjustable air filter permits the user to fine-tune air volume and water mixing as desired. The intake tube adapter with prefilter screen prevents gravel or loose material in the aquarium from getting into the pump
(information taken directly from the manufacture's website)














