The aquarium mesh filter is very fine, which can prevent small fish and shrimp from entering the filter. Inner diameter: 12mm, suitable for waterfall filters. The filter intake strainer removes suspended solids in the water, which can prevent large debris from being sucked in and blocking the filter system. The stainless steel filter aquarium can be installed quickly, just align the pipe diameter and screw it in gently. It is recommended to regularly clean the dirt accumulated on the filter cover with a brush. The mesh of the filter cover is small, which can avoid sucking small shrimps and fishes. Traps particles and debris, enhances biological filtration, prevents small and baby inhabitants from being drawn into filter. Tiny animals like 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.