At last! A super easy-clean filter aimed at the smaller pond. The SpinClean 4500 is so easy to maintain - just turn the handle to stir the sponges and dislodge the dirt. The cleaning technique is as follows: - Cleaning Indicator shows filter is dirty - Switch pump to \'Off\' - Turn dial to \'Clean\' - Turn handle to clean sponges and dislodge dirt - Turn pump back \'on\' and dirty water escapes - Switch pump \'off\' - Turn dial switch back to \'pond\' - Switch pump back \'on\' NOTE: UVC bulb included.