This was the bestselling SpinClean filter. In 2019 this model was re-branded as the \'8000\' with 13w UV. We have a limited number of the \'old\' 11w versions that we are able to bring to you at a knockdown price. We really like these pond filters. Simply turn the external handle to agitate the internal sponges. This super easy-clean feature reduces the frequency of a full clean. The dislodged waste exits the filter via the waste outlet. We tried this filter on our own test pond and were extremely happy with the results - it definitely was more effective than the previous \'entry-level\' filter that we tested. NOTE: UVC bulb included.