Bodies of water need frequent additions of air in order to keep the water oxygenated and keep life forms alive. Usually a body of water will keep being refreshed by air due to the circulation of the water, continuously moving from the surface down to the bottom. However, air can only naturally get into water from the surface and so for life forms deeper in the water, a shortage of air can be a problem and this is noticeable more easily in ponds as they have stagnant water yet are not deep enough for life forms that are used to less oxygen to exist in them. Therefore ponds, if not aerated, can become a problem as far as plants and fish that live near the bottom of the water are concerned. Although mainly this is usually only a problem in ponds that are at least 6 foot deep, shallower ponds can suffer as well if the surface becomes iced over.
Although one popular way to aerate water in a pond is by a fountain because it adds additional beauty to an already idyllic pond, fountains are not the most effective way to aerate a pond. A more effective way is by a diffused system that pumps water into the bottom of the pond and thereby allows oxygen to disseminate into the water on its way to the surface. There are many distributors of quality pond aerators on the internet and so if you think that you may have a problem with aeration in your pond, you should perhaps contact one to determine which aerator would be the best suited for your pond. Often you can tell if a pond has an aeration problem because you may see fish near the surface of the water, gasping for breath or build ups of unsightly algae, plus of course your pond could just have an appearance of seemingly lifeless, which could be true.
When speaking to a supplier of these aeration systems, you should perhaps have the dimensions of your pond readily available, especially the depth of the pond. Aeration systems usually come in kits and these kits are designed for ponds of different sizes. Each kit should contain an diffuser, a pump and a hose which allow air to be pumped into the bottom of the pond.
There is little doubt that a pond can be a beautiful addition to any garden but only if it is exactly that; beautiful. Instead of being beautiful, an un-aerated pond can quickly become somewhat of an eyesore and although ponds are usually a good source as a talking point, the talk about an un-aerated and ugly pond is probably not what you intended.
Apart from diffused aerators and fountains, there are a variety of other choices if you prefer, perhaps one that consists of a propeller near the surface but whichever system you do choose, as long as you do choose one, will ensure your pond remains a good talking point for any visitor.