Aqua-Pics General KH Buffer 1kg
Phosphate free. For those sensitive situations such as planted tanks running CO2. General KH Alkaline Buffer slowly raises KH (carbonate hardness) by approximately 1dKH or 18ppm at a time. Being an alkaline buffer, it has a high pH and this counteracts the acidity from the CO2, stabilising pH and reducing stress on fish. Suitable for both fresh and salt water aquariums.
Directions: 1 level teaspoon or 5g to 60 litres of water will raise KH by approximately 1dKH or 18ppm and will raise and stabilise pH. For planted tanks using CO2 systems, use cautiously with small doses to avoid large pH increases.
| Specification | Value |
|---|---|
| Form | Powder |
| Weight | 1kg |
| PH Range | High alkaline (stabilises pH) |
| Application | Freshwater and saltwater aquariums |
| Best for | Planted tanks with CO2 systems |
FAQ
How much KH buffer should I add to my 100-litre tank?
Add 1 level teaspoon (5g) to 60 litres of water for a 1dKH increase. For a 100-litre tank, use approximately 8.3g (about 1.7 teaspoons) to raise KH by 1dKH. Always monitor pH and adjust gradually.
Can this buffer be used in a saltwater aquarium?
Yes, this buffer is suitable for both freshwater and saltwater aquariums. However, due to the high alkalinity, it should be used with caution in saltwater systems and only after confirming compatibility with your specific water chemistry.
Is this product safe for fish in a planted tank with CO2?
Yes, it is safe for use in planted tanks with CO2 systems. However, it should be used in small, controlled doses to avoid sudden pH spikes that could stress fish or affect plant health.

Kevin Ferguson –
Used this buffer in my planted tank with CO2. It helped stabilize pH after a drop. I added small amounts every few weeks and noticed less fish stress. The powder dissolves easily and the effect is steady.
Mary Marshall –
Good for maintaining KH in a CO2 tank. I used it sparingly and saw a consistent pH level. It’s not a quick fix, but it works well over time. Would recommend for sensitive setups.
Katherine Poole –
Perfect for my freshwater tank where pH dropped due to CO2. Added 1 teaspoon to 60L and saw a gradual rise in KH. No fish behavior changes. Easy to use and effective.