Tiny animals most freshwater shrimp, invertebrates, as well as small fish and fry are at risk of being sucked into the large slots on most standard intake strainers. This stainless steel basket is used to protect shrimp and baby fish to be sucked into the filter.An attractive way to make your aquarium shrimp safe. When cleaning is required, simply brush any accumulated debris off of the Filter Guard with your hand or a soft brush of some sort a tooth brush. Metal filter tube are great for aquarium fish tank, to promote gas exchange and increase dissolved oxygen levels. Great for tropical fish farms, , waste water systems, cooling towers, and commercial and industrial systems.For use with wet/dry filters (here is not included), to improve biological filtration.