The main function of tetrasodium EDTA is to decrease reactivity of metal ions in a product, making it an essential ingredient for soap-making. This ingredient is used to make hard water, soft. It can also be used as a preservative in personal care products, preventing the growth of mold and bacteria. It is useful in formulating dry products where total water content needs to be kept to a minimum. Due to its crystallized form it contains less impurities than Versene 100 chelating agent.