Koi Pond: Water Chemistry
The most basic conditions of your koi pond water chemistry are the pH factor (which stands for potential Hydrogen) and water hardness. These factors alone can determine the life or death of your koi pond’s inhabitants (I call them the “Fam Fam”).
The pH of the koi pond water is measured on a scale of 1-14, with a reading of 7 considered “neutral.” Any reading above 7 is alkaline; anything below 7 is acidic. Most fish prefer a pH value of 7.2 to 7.6, or just slightly on the alkaline side of the scale. However, koi and goldfish can adjust to gradual changes in pH from as low as 7 to as high as 8.5 and still remain healthy and flourish.
Hardness or buffers in the koi pond water can raise the pH levels. Even though hardness is a separate measure from pH, the two respond to each other chemically. Pure or “distilled” water has a pH of 7 and an absence of buffers or hardness. Neutral pH is unstable, however, and if it has no buffers or hardness, it can quickly drop to the lower (acidic) end of the pH scale – as low as 4.2 to 4.8. At this level of acidity the fish’s gills become burned and eventually become unable to extract oxygen from the water, ultimately suffocating.
