If you have a big pond
- say 30, 000 litres or more
- then you need a large filter to look after the waste. You could go
This pump & filter system is even good enough for keeping koi (a maximum size of 18, 000 litres suggested). The compact multi-bay
...This product has been discontinued by the manufacturer, why not take a look at the Lotus Green Genie 18000 instead?