It is fit for the protection of water products from microorganism, such as emulsion varnish, macromolecular synthesis latex, cosmetic, detergent, adhesive, enamel, loading agent and sealant, and it can be used for additive in diluted metal manufacture liquid. The normal concentration is 0.05～0.40%. It is especially fit for the products that do not dissolve in Mg²⁺/Cu²⁺ divalent ion antiseptic.