This large professional pond filter set up is ideal for koi ponds up to up to 18,000 litres (4,000 gallons) and goldfish ponds up to 36,000 litres (8,000 gallons). The filter included contains two filter bays which each contain a filter foam, one blue coarse foam and one fine yellow foam that catches all but the tiniest debris particles, while the superb solids-handling pond pump does not cost much to run. This set contains the following components (please click links below for more information): • PondXpert FreeFlow 15000 pond pump • PondXpert MultiChamber 36000 flow-through filter * Saving made when compared to buying items separately.