The metal filter tube is ideal for the aquarium, to promote gas exchange and increase dissolved oxygen levels. Small mesh allows replacement of the outer filter inlet filter or waterfall filter. Avoid inhalation of weak shrimp. Small animals such as most freshwater shrimp, invertebrates, as well as small fish and fry are at risk of being drawn into the large slots of most standard intake strainers. When cleaning is needed, simply brush the debris that has accumulated on the filter guard with your hand or with any soft brush, such as a toothbrush. Ideal for tropical fish farms, koi ponds, wastewater systems, cooling towers and other commercial and industrial systems.