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Aqua One Carbonate Hardness (kH) Test Kit
$14.95
Carbonate Hardness KH Test Kit
Regular water testing is the best way to curb potential pond/aquarium disasters before they happen. The most commonly tested parameters are pH, Ammonia and Nitrates. But there are other things we can test for that are just as important! The Aqua One QuickDrop Carbonate Hardness (KH) Test Kit allows you to accurately monitor carbonate hardness, helping to prevent sudden pH swings and ensuring your aquarium ecosystem remains balanced.
Carbonate hardness (KH) is a measure of the water’s buffering capacity — its ability to neutralise acids and maintain a stable pH. Low KH can result in dangerous fluctuations in pH, causing stress or even death in fish and invertebrates. By testing KH regularly, you can ensure your aquarium remains a safe, healthy environment where aquatic life thrives.
Specifications:
- Testing Range: +1 dKH
- Number of Tests: Up to 60 per kit
- Suitable for: Coldwater, Tropical, and Marine aquariums
Water Testing Advice:
Regular KH testing is one of the easiest ways to avoid pH crashes and keep your tank stable.
Regular KH testing is one of the easiest ways to avoid pH crashes and keep your tank stable.
We offer free water testing in-store — simply bring us a sample, and we’ll check it for you. If you’re not local, most aquarium shops will also provide water testing services.
Why Test for Carbonate Hardness?
- Maintains a stable pH and prevents sudden swings
- Supports healthy fish and plant growth
- Improves the effectiveness of biological filtration
- Provides early warning of imbalances before they become a problem
Ideal KH Levels
- Freshwater community aquariums: 4–8 dKH
- Koi and Goldfish ponds – 5-10 dKH
- Planted aquariums: 3–8 dKH
- Cichlid tanks: 8–20 dKH
Keeping stable kH levels is more important than hitting a specific number. These are rough guides – always remember to research your individual species to see what they prefer, all fish and plants are different!
If KH Is Too Low
Low KH can lead to unstable water conditions and dangerous fluctuations in pH. Fish may show stress, loss of appetite, listlessness, or sudden deaths due to pH crashes.
How to Correct Low KH
- Use a KH buffer or alkalinity booster product.
- Add crushed coral, limestone, or aragonite sand to naturally raise KH.
- Make gradual adjustments and test regularly to avoid sudden changes.
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