3750mlStimulates the growth of oxygen plants and the development of microorganisms. GH Plus is a very effective means to increase the hardness of the pond water.Good water hardness is necessary for a stable and healthy pond. With a joint hardness (GH) of at least 6 ° DH, oxygen plants and microorganisms can develop well. A good GH value prevents acidification of the pond. Rainwater in particular lowers the GH value and promotes acidification.Regular checking of the water hardness is therefore desirable. GH Plus increases the hardness of the pond water without any problems. It works quickly and does not cloud the water.Also available in 1500ml (1330660)