Aeration systems for use in ponds are specifically designed for use with ponds of a certain depth. This means that it is important to read any pond aerators instructions before making a purchase, to ensure you are buying the correct system or your pond. Usually these systems are divided into two groups, those that are suitable for ponds with a depth of less than 6 feet and those that are suitable for deeper ponds. The most popular aeration systems for shallower ponds are the fountain and the propeller systems. Obviously a fountain is a popular choice as besides being an effective aerator, it can also add character and style to the pond. The fountain basically does two jobs which make it efficient as an aeration system. Firstly it creates circulation within the water of the pond and secondly it throws water up where it comes into contact with the air from which it can draw oxygen to keep it fresh. The circulation of the water ensures that the same water is not continuously thrown into the air but that circulation will only extend to a depth of 6 feet, no more. To add to the popularity of fountains, in recent years floating fountains have been developed as aeration kits and these allow for even more scope when designing how you want your pond to look. The propeller system works in the same way as a fountain in that it also creates a circulation in the water but, instead of throwing water up in order for it to aerated, the propellers churn the water, allowing it to be aerated that way. For ponds with a depth of more than 6 feet these systems would not allow the water at the bottom of the pond to be aerated and that water would then become devoid of oxygen, promoting the growth of algae which can over run the pond making it unsightly and smelly. A diffusion aeration system though, can aerate all the water in a pond, including the water at lower depths. This type of system uses a compressor, a diffusion unit and an air hose which connects the two. The compressor stays on dry land and once powered, pushes air through the hose to the diffusion unit. This system is effective for deeper ponds as the diffusion unit is placed at the bottom of the pond where it releases the air, allowing it to return to the surface. Whilst the air is in transit through the different depths of water, it is allowing that water to become aerated, receiving the oxygen it needs to stay fresh.
Although all the aeration systems need a source of power in order to function, for those ponds that are located far from a mains power source or for those owners that would rather not pay a higher electricity bill, some aeration systems now come complete with their own source of power, perhaps a windmill that can generate enough power to operate the device or a solar kit that operate the aeration system for up to 3 days without seeing the sun.