What if my koi are gasping?
Before we even start to think about the oxygen requirements of
our koi, our pond is already full of oxygen consuming organisms.
- If a pond or filter are allowed to become oxygen deficient for any
period of time, anaerobic conditions will prevail causing unstable
water conditions and the tell-tale bad-egg smell.
- How do they work, and how can we measure how efficient and effective
we are at adding extra aeration?
- Temperature: Oxygen behaves in a surprising way (compared to other
solutes, such as salt) in that as the water temperature rises, its
ability to dissolve oxygen reduces.
- At lower temperatures, water will dissolve greater levels of oxygen,
making it more difficult for your aeration systems to completely
saturate your water.
- Conversely, at high water temperatures, saturation can be achieved
more easily as water can only hold reduced levels of DO.
- The most common form of air pump found around a koi pond is one that
uses a rubber diaphragm.
- Oxygenated water that enters the pond at the waterfall will rarely
sink to lower layers of water, being effective only at the surface.
- Furthermore, the physical work required to move water to oxygenate
is significantly less efficient than moving air, especially when it
only affects the upper layers of a pond.
- The large bubble size also means that only the upper layers of water
receive the full benefit of the freshly oxygenated water.
- There are many different types of diffusers available to the koi
keeper, ranging from the basic (and disposable) airstone to other
larger (and permanent) self-cleaning diffusers.
water pond oxygenate aeration
air koi diffusers bubble dissolve saturation pump temperature litre
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