Original sentence: It is possible to measure the level of hard water by obtaining a free water testing kit.These are supplied by most water softening companies.Various obsolete "degrees":
Edited sentence: In most cases the temporary hardness kit is a good approximation, but anions such as hydroxides, borates, phopshates can have quite an effect on temporary hardenss test kits.It is possible to measure the level of total hardness in water by obtaining a total hardness water testing kit.Temporary hardness test kits do not normally measure calcium and magnesium levels but normally use an approximation based on some form of alkalinity test.These kits measure the level of calcium and magnesium in the water.To accurately measure temporary hardness would involve a series of tests to work out how much bicarbonates and carbonates are present and how much calcium and magnesium is present and what percentage combination there is.Various alternative "degrees":