Suitable for ponds up to 20,000 litres 4,400 gallons. Maximum flow rate is 12,000lph.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 20000 includes a built in uvc functionality, keeping your pond clean and clear for the long term!uvc bulb included. While 2019 onwards models require 24w single ended, pre 2019 models require 18w single ended bulbs.graduated foams and biological media included the larger spinclean filters include both coarse and fine foam filtration along with biomedia located beneath the foams which provide biological filtration.