API® GH & KH Test Kit - General and Carbonate Hardness Test Kit Flow Rate at 6 Feet of Head_2400 GPH Four kits available:

Four kits available:

For pond use only

amphibians

Build your own fountain

API® GH & KH Test Kit - General and Carbonate Hardness Test Kit Flow Rate at 6 Feet of Head_2400 GPH Four kits available:Keep your fish healthy and thriving by testing your aquarium water's GH levels regularly with this easy to use API GH & KH TEST KIT for freshwater aquariums. Testing water parameters weekly helps prevent invisible water problems that can be harmful to fish. Water hardness is a measure of the dissolved mineral content of water. Contains one (1) API GH & KH TEST KIT Freshwater Aquarium Water Test Kit, including 2 bottles of testing solution and 2 test