Useful when our Algae eaters can not cope with cleaning the aquarium glass :). It is used to clean aquarium glass from any deposit, algae and other contaminants. Significantly improves the aesthetic experience by creating an idea of a healthy aquarium. There are also magnetic scrapers consisting of two elements. One of them inside the aquarium with a razor blade collecting dirt and algae and the other held out by the aquarist. Both components are moving together - magnet is doing it's job here.