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Kemira performic acid (PFA) chemistry is a halogen-free biocide program that is highly effective against primary-biofilm forming bacteria. PFA is a reaction product of formic acid and hydrogen peroxide, and its biocidal activity is based on active oxygen. PFA is thus halogen-free, corrosion safe and also fully biodegradable. This highly efficient biocide improves paper machine cleanliness while, at the same time, it does not generate any persistent AOX compounds in waste water that could be harmful for the environment. PFA also leaves no biocidal residuals in the paper product, making it safe for end users and the environment. Lucart PM 7 in Borgo a Mozzano, Toscana, Italy gained several advantages by using PFA, including improved machine efficiency and increased felt life-time.