Suitable for ponds up to 20,000 litres 4,400 gallonsthis uv filter has a unique easy clean mechanism meaning there is no need to take the sponges out of the filter simply turn the handle and watch the dirty water go to waste.backflush system you don’t need to lift the lid off this filter to clean it! Just operate the backflush system as follows br 1. Turn your pump off and turn the blue dial to ‘clean’. Br 2. Turn the handle to clean sponges and dislodge dirt. Br 3. Turn pump back on and dirty water escapes 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 these filters include a cleaning indicator.in built uvc this pressurised filter 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 pondxpert spinclean 20000 includes both coarse and fine foam filtration along with biomedia located beneath the foams which provide biological filtration.