Suitable for ponds up to 4,500 litres 1,000 gallons. Maximum flow rate is 3,000lph.this pond filter threatens to 'stir up' the pondkeeping world! Based on the bestselling pondxpert spinclean filter this 'plus' model includes an in built motor which cleans the foam filters for you. It is a step up from other pond filters on the market.automated backflush system you don’t need to lift the lid off this filter to clean it! Just operate the automated backflush system as follows br 1. Turn your pump off and turn the blue dial to ‘clean’. Br 2. The filter will show a red light and the motor will turn the cleaning paddle against the sponges. Br 3. After 3 minutes cleaning a ‘beep’ indicates cleaning is finished. Switch the pump on to flush the dirt via the dedicated waste outlet. Br 4. Once the waste outlet water runs clear, turn your pump off and turn the dial back to ‘pond’. Br 5. Switch pump back 'on'cleaning indicator this pressurised filter includes a cleaning indicator.in built uvc the pondxpert spinclean auto 4500 includes a built in 11w uvc functionality, keeping your pond clean and clear for the long term!uvc bulb includedgraduated foams included the spinclean filters include both coarse and fine foam filtration, which remove a significant amount of debris from your pond!