API® GH & KH Test Kit - General and Carbonate Hardness Test Kit Aeration Pond Size 1 - 4 Acre " in diameter and has

" in diameter and has nearly 25 square inches of surface area for bacterial colonization

Dimensions:  13" Dia x 14 1/2"T

Available in 1 cubic foot box

magnesium and other trace elements for improved bone and scale growth of Koi and Goldfish

API® GH & KH Test Kit - General and Carbonate Hardness Test Kit Aeration Pond Size 1 - 4 Acre " in diameter and hasKeep 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