All offer replaceable mechanical filter medium of some type for trapping large particulates of excess food and fish feces.
Water cascading from one chamber to the next helps to oxygenate the water.
ImpellAir mixes fresh air with water, supplying oxygen to beneficial bacteria AdjustaFlow adjusts intake tube depth and regulates water flow Innovative BioGrid design supports maximum bacterial growth. You'll appreciate how straight forward our Sea Reef filters are to operate and maintain. They contain no moving parts which potentially break down. We divide them equally between filter area and sump, allowing a large biological capacity and the flexibility to add plenty of peripheral equipment. All Sea Reef filters come with our patented Aqua Balls media for the maximum bacterial growth.