Ever since it launched in 2012 this super little air pump from Hozelock went straight to the top of our bestsellers list! This pump from renowned brand Hozelock is perfect for very small ponds. Adding oxygen into a fish pond is very important for fish health, particularly in densely stocked ponds and in the summer months when oxygen levels decline. Air pumps can also be used to circulate water and help prevent the pond from freezing in winter. There are many other small air pumps on the market but it is unusual to find a fully weatherproof version at this low price. This pump can aerate a pond with a volume of 2,200 litres (1,800 if keeping fish and 860 if keeping koi).