The Aquaforce 4000 is perfect as a waterfall or filter pump for small ponds. It would suit most ponds ideally up to a volume 8000 Litres 2000 gallons.The 4000 model is one of the most popular model sizes in the range.This pump has a very large filter cage and has little maintenance requirements. It can run 247 for as long as you need it to and it is backed up by a 3 year manufacturers warranty.Your FREE Gift PondXpert SkimmsterThis pond skimmer features a 2500lph pump and floats on your pond surface sucking in dirt and debris.