Although most people with ponds already have a pond aeration system, not all of those people fully understand their value. The need for an aeration system will gladly be explained to you by a supplier who will probably also offer you pond aerator support but basically, a pond aeration system is needed to help the water in your pond stay healthy. As a pond is a stagnant body of water, it will not naturally have contact with the air other than at its surface. This means that the water at the lower depths of the pond will become starved of oxygen and the proportion of that un-oxygenated water will grow. Without oxygen the water cannot sustain fish life but algae can thrive. The algae will start to grow at the lower depths and then eventually take over the whole pond which will become unsightly and smelly.
An aeration system is therefore necessary as it either makes the water come in contact with the air or introduces air to the water in the pond. Aeration systems can basically be broken down into two categories; those for shallower ponds with a depth of no more than 6 feet and those for deeper ponds with a depth of over 6 feet but there are several systems available for both categories. Perhaps the most popular aeration system for the shallower ponds is a fountain. A fountain is an effective aerator but also adds character and beauty to a pond and that probably accounts for its popularity. How the fountain works as an aerator is that it tosses the water in the air, allowing that water to become aerated. The fountain though, does not keep tossing the same water in the air it creates a circulation which allows all the water to get a chance to be tossed in the air, keeping the entire body of water aerated.
The propeller system is also popular but instead of tossing water in the air to be aerated, it relies on the water being aerated from the agitation the propellers cause in the water. Like the fountain though the propellers also cause a circulation enabling all the water to be aerated. These two systems are for shallower ponds as the circulation they create only affects the water to a depth of about 6 feet. For deeper ponds a diffusion aeration system is usually used. The diffusion system comprises 3 parts, a compressor and a diffusion unit which are connected by an air hose. When working and Sitting on the banks of the pond, connected to a power source, the compressor pushes air through the hose to the diffusion unit which is located at the bottom of the pond.
As the air reaches the diffuser, the diffuser releases it into the deep water. The air continues to aerate the water as it travels to the surface, ensuring all the water, at all depths, is adequately aerated. Today it is possible to get aeration systems that co0me with their own power supplies for ponds which are in remote locations.