What is a water hardness testing kit?
A water hardness testing kit is a kit containing ingredients for measuring the amount or number of grains per gallon of the dissolved salts of magnesium or calcium present in the water. There are two types of kits available. The first involves the use of three chemicals which are added in succession to a sample of water to be tested. The number of drops of the last solution required to change the color is a measure of grains of hardness per gallon. The second type of kit makes use of the fact that soap will not lather readily in hard water. Drops of a standard soap solution are added to a sample of water. The number of drops required to produce lather equals its hardness in grains per gallon. A rough idea of the hardness can be gained by washing your hands in some of it. Soft water lathers readily. Like pH, there is a good deal of controversy as to the practical importance of water hardness. Most fishes can certainly stand extremely hard water if they are gradually accustomed to it. Ma
