Aquarium filter with emptying tube - tube has breaks or slots which are bigger at one end

摘要

The aquarium filter has a central tube (6) which is closed at one end. It has a set of longitudinal slots and is fitted in a bore of a filter body. The tube carries away the filtered water. The breaks or slots (9,10) are widest at one end of the tube. When the slit length is equal and there is the same number of slits, the slit width is tapered. Specifically, the size of the breaks or slots varies in zones from one end of the tube to the other.