The API GH & KH Test Kit provides fast, accurate testing to help maintain stable conditions in freshwater aquariums. Testing weekly helps prevent invisible water problems that can stress fish and plants. Water hardness measures the dissolved mineral content in aquarium water, and there are two types: General Hardness (GH) and Carbonate Hardness (KH).
GH and KH levels should match the natural habitat of the fish and plants in your aquarium. Low KH can lead to rapid and wide pH shifts, causing stress to aquarium fish. This kit helps aquarists maintain consistent hardness levels for a healthy, balanced freshwater tank.
Key Features
Tests General Hardness (GH) and Carbonate Hardness (KH) in freshwater aquariums
Helps prevent pH swings caused by low KH
Supports healthy fish and aquarium plant growth
Fast, accurate drop‑count titration method
Recommended for weekly testing to maintain stable aquarium systems
Adding tap water may increase water hardness
Specifications
Includes GH test bottle, KH test bottle, instructions, and two capped test tubes
Suitable for freshwater aquariums
Measures GH and KH using simple drop‑count titration
