Making sure your pond has the correct level of aeration is vital to helping maintain healthy fish. Not only do the fish require a constant supply of oxygen but the bacteria contain in the filters require oxygen to fully break down the harmful by-products created by the fish.
The best way to avoid these problems is to use a high quality air pump connected to several airstones in the filter box and pond to ensure maximum efficiency.
There are several factors that affect the amount of aeration required in a pond. The more fish you have, the more oxygen is needed, larger fish require more oxygen than smaller fish, warm water will hold less oxygen than cold water and fish tend to be more active at warmer temperatures and therefore use up more oxygen. This means that a heavily stocked Koi pond in the height of summer will require a great deal of aeration.
