This white paper explores the use of Water for Injection (WFI) and glycol-based fog for airflow visualization in pharmaceutical controlled environments. Learn how ultrasonic water fog provides a residue-free alternative for smoke studies, particularly in isolators and closed systems, while aligning with regulatory expectations such as EU GMP Annex 1. The paper outlines key differences in particle behavior, material compatibility, and operational impact to help teams select the most appropriate visualization method for their application.

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