Microplastics are plastic pieces that measure less than 5 millimeters across. Some microplastics have formed by breaking away from larger plastics that have fragmented over time. Others have been made small intentionally. The microplastics can have a toxic effect on fish and other aquatic life, including reducing food intake, delaying growth, causing oxidative damage and abnormal behavior.
Filtration is the conventional way to remove microplastics from water. Carbon block filters: Carbon block filters can filter contaminants as small as 0.5 micrometers, or 0.0005 millimeters. Most microplastics are about 2.5 micrometers, which makes carbon block filters an effective option for eliminating microplastics from drinking water.
A fish tank usually use a filter that cleans the water of debris, removes the toxic buildup of ammonia and nitrates, and aerates the water so your fish can breathe. A sump is a supplementary tank that is placed lower than your main marine fish tank and collects drainage and houses your equipment. Sumps work via gravity so water is pumped into the main display tank from the sump via a return pipe and aquarium sump pump. Water circulates around the tank and fills it to the point where it overflows down a drain pipe, and back to the sump.
We expect to see contaminants such as microplastics and garbage. The contaminants will stuck in the filter so that the water is cleaner.
Water pump can possibly draw out fishes that stuck inside the filter and they will eventually die.