The Salifert KH/Alkalinity Profi Test is a liquid water-testing kit designed to measure carbonate hardness (KH) and alkalinity in aquarium water. It uses a titration method with a sharp color change to provide accurate readings and detect small fluctuations in alkalinity. Regular testing helps monitor pH buffering capacity and maintain stable water conditions, particularly in reef aquariums where alkalinity is essential for coral growth and skeletal development. It is suitable for freshwater and saltwater aquariums, as well as garden ponds.