Aqua Perfect PH Down

Importance of pH in a Koi Pond

Maintaining the correct pH level in a koi pond is essential for the health, colour, and overall well-being of your koi fish. Koi thrive best in a stable pH range of 7.0–8.0, where their metabolism, digestion, and immune system function optimally.

When pH Is Too High – Negative Effects on Koi

An excessively high pH can cause serious stress to koi and lead to multiple health problems:

• Loss of White Colour Quality
  High pH can damage the skin and slime coat, causing white areas (Shiroji) to appear dull, yellowish, or stained.

• Reduced Appetite
  Koi exposed to high pH often show a decrease in feeding activity, leading to poor growth and weakened condition.

• Lethargy and Stress
  Elevated pH disrupts normal physiological processes, making koi appear inactive, sluggish, and stressed.

• Increased Disease Susceptibility
  Stress from unstable or high pH weakens the immune system, making koi more vulnerable to parasites, bacterial infections, and disease outbreaks.

Why pH Control Matters

Consistent pH management helps:

• Preserve vibrant koi colours

• Improve feeding response and digestion

• Reduce stress and mortality

• Support long-term koi health and pond stability

Regular testing and proper pH control products ensure a safe, balanced environment where koi can thrive.