Water Conditions For Healthy Koi

There will certainly be a lot of varying feelings on the best water conditions for koi but one thing remains constant: poor water quality leads to a large group of other health issues that are certainly avoidable with appropriate care. Because stress originates from poor water quality, follow these rules for healthy water and healthy koi.

Broken down Oxygen

Oxygen levels ought to be at least 5.0 mg/L for koi. In the fish world, there is some variation with the tolerable degree of disintegrated oxygen in the water but 5.0 is a decent baseline. As a kind of perspective, 5.0 is the base for koi and 18 mg/L is the physical maximum that water can hold. Similarly as a reminder however, chilly water can hold more broke up oxygen than warmer water so higher summer temperatures (and stuffed ponds) will lead to bring down disintegrated oxygen, which is really when you will want to pay attention to it the most. Oxygen gets disintegrated into your koi pond in several ways. At the exceptionally surface there is limited dispersion happening between the atmosphere and the water and that accounts for just a small amount of disintegrated oxygen. Choppiness will also agitate the water enough to generate disintegrated oxygen in your pond and this often comes through falling water as from a small water fall. A dependable and popular way to increase the broke down oxygen in a koi pond is by an air stone on the base of the pond or by spout or fountain shooting water very high.


Okay, back to science class everybody because its opportunity to examine pH. As you may recall pH has something to do with acids. It’s all about acidity and alkalinity. The pH scale is a logarithmic one meaning when your pond bounces from 7 (neutral) to 6, its not just getting a little bit progressively acidic, its getting multiple times increasingly acidic. Alternately, when your pond tests at 7.5 and then gets increasingly alkaline by bouncing to 9.5, at that point your pond just got multiple times progressively alkaline (multiple times 10). So it’s a serious deal when your pH changes and can definitely affect your koi in negative ways. pH, or intensity of Hydrogen, should range in your pond somewhere close to 6.8 and 8.2 but do your best to keep it as stable as conceivable.

Ammonia, Nitrites, Nitrates

As you may recall, the general pattern of waste in your pond starts with ammonia discharged by your fish then bacteria and oxygen break it down to nitrites which later get broken into nitrates at that point free nitrogen. Ammonia, nitrites and nitrates all have the ability to cause health issues for your koi if their levels are not held under wraps. Along with other health issues, ammonia can essentially consume your fish’s gills and diminish its ability to extract broke up oxygen from the water. High nitrites can damage your koi’s kidneys and sensory system and high nitrates, for broadened periods, can cause your fish’s resistant system to be undermined. Ammonia and nitrites and the most irksome with regards to health issues for your koi but don’t underestimate the intensity of nitrates over extensive stretches of time. Here is a rule for these three water science measurements.

– ammonia: levels ought to be zero. Contingent upon your pH, you can pull off 0.5ppm (parts per million) or 1 ppm for a brief timeframe but remember that above a pH of 8.0 ammonia turns out to be increasingly dangerous.

– nitrites ought to be under 0.25 ppm but ideally you ought to have a reading of zero.

– nitrates: a reading of 20 to 60 ppm is acceptable.


The utilization of salt in koi ponds has, for long time, been a proven strategy to deal with various water quality and health issues that arise. A portion of the benefits of salt is that its a cheap way to keep some disease at bay, control algae and may also bring down nitrite toxicity. Additionally, salt plays a part in the osmotic weight between the fish and the outside aquatic condition. There is a differential between the solute concentration of the fish’s blood and the new water that it swims in so the addition of salt actually brings down that concentration differential and makes it easier on the fish by decreasing the amount of work its body has to do. A salinity of up to 5 ppt (parts per thousand) or 0.5 % is acceptable.


Temperature clearly plays a major job in the overall health of your pond and it warrants your attention. Temperature can exacerbate existing issues, especially higher temperatures. For example, warmer water holds less disintegrated oxygen and ammonia can be increasingly dangerous. Although koi can handle temperatures of somewhere in the range of 35 and 85 F degrees its best to keep your fish in water that ranges somewhere in the range of 65 and 75 F degrees. And as with pH, attempt to avoid large temperature swings.