Any equipment, facility or device constructed or installed either prior to or subsequent to the effective date of this act and used primarily for the purpose of abating or preventing pollution of the atmosphere or the waters of this State and which has been certified to be an air or water pollution abatement facility by the State Commissioner of Health, as hereinafter in this act provided, shall be exempt from taxation under this chapter to which this act is a supplement.
N.J.S. § 54:4-3.56