Pond Aerators and in effect, Aeration of the water, in fish ponds adds oxygen to the water and helps to release any noxious gases that might be in the water.
Utilizing this form of aeration makes the water a more healthy and suitable environment for pond life, including fish (that includes Koi!).
It is particularly important for large, deep ponds and lakes with low dissolved oxygen levels, and for koi ponds.
There are various ways that you can achieve pond aeration, including the use of pumps that you will find alongside your other fish pond supplies.
Pumps and filters go hand-in-hand, so the pump provides aeration as well as powering the filter that also helps to keep your pond water clean and healthy.