The Ricca Chemical water hardness buffer is composed of 67.17% water, 29.76% monoethanolamine, 2.35% hydrochloric acid, 0.46% ethylenediaminetetraacetic acid (EDTA), disodium salt, dihydrate and 0.25% magnesium chloride hexahydrate. It is suitable for research, manufacturing and laboratory use. It can be stored at a temperature of 15 to 30 degree C.