The JBL ProAqua Test KH is an essential tool for maintaining a stable and healthy aquarium. Carbonate hardness (KH) plays a crucial role in buffering the water’s pH and preventing dangerous acid drops that can harm fish and plants.

This professional-grade liquid test kit from JBL ensures precise and reliable measurements for both freshwater and saltwater aquariums. By keeping your KH within the ideal range, you support the biological balance of your aquarium, promoting strong plant growth and healthy fish metabolism.

🧪 Key Features

• High Accuracy: Measures carbonate hardness with precision up to 1 °dKH per drop.

• Quick & Easy to Use: Simple drop-by-drop titration — ideal for both beginners and experts.

• Clear Color Change: Instantly visible shift from blue to yellow to identify your KH level.

• Long-Lasting Kit: Sufficient for approximately 50 tests.

• Universal Compatibility: Suitable for all freshwater, marine, and pond systems.

• Detailed Instructions: Includes an illustrated manual for correct test performance and interpretation.

🐠 Why Carbonate Hardness Matters

Carbonate hardness acts as a pH stabilizer, preventing sudden pH swings that could stress or kill aquarium inhabitants.
Recommended KH levels:

• Freshwater aquariums: 4–8 °dKH

• Planted aquariums: 3–6 °dKH

• Marine aquariums: 7–12 °dKH

By testing regularly, you ensure a stable environment for fish, corals, and plants, supporting their natural behavior and coloration.

🧭 How to Use the JBL ProAqua Test KH

1. Rinse the test vial with aquarium water.

2. Fill with 5 ml of water sample.

3. Add one drop of reagent at a time, swirling after each drop.

4. Count the drops until the color changes from blue to yellow.

5. Each drop = 1 °dKH.

Record your result and adjust the KH level using JBL water conditioners if necessary.

📦 Package Includes

• 1 × JBL KH reagent

• 1 × Glass test vial with cap

• 1 × Color reference chart

• 1 × Multilingual instruction leaflet

💡 Ideal For:

• Beginner aquarists learning water chemistry

• Experienced hobbyists seeking accuracy

• Planted and community aquariums

• Marine reef and saltwater setups