In the present invention, it is an object to improve display quality by improving response speed of a liquid crystal element in a liquid crystal display device, in particular, response speed in the case of falling. More particularly, the invention contemplates a introducing a pressurized liquid into a cavitation generating chamber to create and discharge a cavitating stream, and a secondary inlet for injecting abrasive material, such as silica, into the chamber to improve cleaning effectiveness. The date feature and date tabs may be molded together with the remainder of the urinal screen body, forming a one piece construction made of a plastic material that may withstand the harsh environmental conditions within a urinal or toilet.