The API General & Carbonate Hardness (GH & KH) Test Kit 2 × 37 mL is a precision aquarium hardness test kit designed to accurately measure both general hardness (GH) and carbonate hardness (KH) in freshwater and saltwater aquariums. Monitoring GH and KH is essential for maintaining proper mineral balance and stable pH levels in your aquarium.

This dual test kit allows you to track calcium and magnesium levels (GH) as well as buffering capacity (KH), helping you prevent sudden pH swings and support fish, plants, and invertebrates. Ideal for routine testing, it provides reliable results to help maintain balanced and stable water conditions.

Key Features

• GH & KH test kit for complete hardness monitoring
• Measures general hardness (GH) and carbonate hardness (KH)
• Helps maintain stable water conditions and pH balance
• Supports proper mineral levels for fish and plants
• Easy-to-use liquid tests with clear colour change results
• Includes 2 × 37 mL bottles for long-term use
• Trusted API quality for dependable performance

Compatibility

Suitable for:

• Freshwater aquariums
• Saltwater and reef aquariums
• Planted tanks and mineral-sensitive species
• Routine water testing and maintenance

How to Use

Add the test solution to a water sample and count the drops until the colour changes to determine GH and KH levels. Test regularly to maintain proper water balance.