This system is suitable for goldfish ponds up to 9,000 litres (2,000 gallons) and koi ponds up to 4,500 litres (1,000 gallons). The filter and pump included in it both offer the features found on similar products but at only half the price. This set contains the following components (please click links below for more information): • PondXpert UltraFlow 6000 pond pump • PondXpert MultiChamber 9000 flow-through filter * Saving made when compared to buying items separately.