KH Buffer Calc

How to raise KH in a Koi pond

Carbonate Hardness (KH) is perhaps the most important parameter for pond stability. It acts as a chemical buffer that neutralises acids produced by your filter's nitrifying bacteria. Using a koi pond KH calculator allows you to calculate the exact amount of Sodium Bicarbonate (baking soda) needed to maintain a stable environment and prevent a pond pH crash.

What is a safe KH level for Koi?

The ideal range for a koi pond is generally between 4 and 8 dH (approx. 70 to 140 mg/l). If your KH drops below 3 dH, your pH can become unstable, potentially leading to "acidosis" which is fatal for fish. Our KH buffer calculator uses precise maths to help you reach your target safely.

Safe Sodium Bicarbonate Dosing

It is vital not to raise your KH too quickly. A safe rule of thumb is to increase your levels by no more than 20mg/l (approx. 1 dH) per 24-hour period. This prevents "hardness shock" and keeps your pH from swinging too violently. Always dissolve your bicarb in a bucket of warm pond water before adding it gradually near your filter returns.