Because an anti-microbial treated filter will not substitute the need to properly maintain the chemistry of the water to provide a healthy environment, any claims must clearly refer only to the protection of the filter itself.
EPA’s Pesticide Registration Notice 2000-1 provides guidance along with examples of claims and claim language that can be used. For instance using the word antibacterial as a claim rather than anti-microbial would lead to the requirement to register the article as a pesticide product.
EPA’s reasoning is that in the U.S. consumer market place, the term anti-microbial has been typically associated with the protection of articles, whereas antibacterial has been more frequently associated with products designed to control human pathogenic microorganisms.
Therefore according to EPA, use of the term antibacterial makes a public health claim and recall that treated products with explicit or implied public health claims would have to be registered under FIFRA.
http://www.fiberwebfiltration.com/pdfs/ ... robial.pdf