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Ideal Water Parameters for Healthy, Thriving Koi

Ken Le
Oct 22
1 min read

Clear water does not always mean safe water. Test your pond regularly:

  • pH: 7.0–8.5. Stability is more important than chasing a perfect number.

  • KH (alkalinity): About 100–150 ppm to help prevent sudden pH drops.

  • Ammonia: 0 ppm.

  • Nitrite (NO₂): 0 ppm.

  • Nitrate (NO₃): Ideally below 20–40 ppm.

  • Dissolved oxygen: Above 5 mg/L.

  • Chlorine/chloramine: 0 ppm before adding tap water to the pond.

Test more often if your pond is new, you have added fish, or your koi show unusual behavior. A well-functioning filter, plenty of oxygen, and stable water are the foundation of a healthy koi pond.

These are general guidelines; the right conditions can vary depending on your pond and water source.

 
 
 

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