When Frank Miller, director of hospitality services at the University of Western Ontario, received a visit from a representative of the local wastewater treatment plant last fall, he soon had a lot of questions about the request the visitor had come to make. “They wanted us to eliminate our use of quats [shorthand for quaternary ammonium compounds, usually including benzalkonium chloride as their active ingredient] to ensure they would no longer enter our campus drainage system,” says ...

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