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How to Oxygenate a Pond
22/07/2011
Air Pumps
An air pump is a no-nonsense form of aeration that simply injects a stream of air into the water. This air-stream is diffused where it enters the pond water (near the floor if possible) by an air-stone. The air-stone forces the air into multitudes of tiny bubbles so it is more readily dissolved into the water. Simple air pumps such as the Blagdon PA1 and PA2 are very inexpensive but the unit itself must be kept dry (typically the unit would be housed in a garage or out-building with the air-hose running outdoors). All-weather air pumps such as the Hozelock 45 are more powerful, offer quiet operation and can be left outdoors. Another very popular approach is that offered by solar air pumps – these are lower power but need no wiring-up, can be left outdoors and work when the sun is out – just whne the pond needs more oxygen.
Diffusers
There are many types of diffusers on the market and they are the most effaced form of mechanical aeration. Air bubbles are passed through the water releasing oxygen as they go. Look for diffusers that produce large numbers of fine bubbles which will be far more efficient. Large bubbles may look better, but a stream of few large bubbles will have a smaller contact areas with the water. Air-stones can also be used with a diffuser, or pump and venturi.
Oxygenator Plants
Oxygenators are submerged plants are positioned on the pond bed. Most remain completely submerged although a few do produce flowers that peep through the water surface. These are fast growers and breathe vast levels of oxygen into the water during the day. However the irony is that while they produce oxygen in the day they consume it at night, exuding carbon dioxide, if there are allowed too much space they can overwhelm and smother a pond.
Fountains and Falls
Oxygen enters the pond anywhere the water is in contact with the air. Increasing the surface area naturally raises the amount of oxygen in the pond and that – by disturbing the water surface and creating ripples is exactly what fountains and waterfalls do. As such, they serve both a decorative and functional role in a pond disturbing the water to keep oxygen circulating and prevent stagnation and the growth of the dreaded blanketweed.
