Which sequence correctly describes the required steps when using OsmoFume?

• A. Apply OsmoFume and seal holes immediately
• B. Apply OsmoFume, apply HHCB per stick, then plug holes
• C. Plug holes before applying OsmoFume
• D. Apply OsmoFume and HHCB after sealing

Answer: (B)

The sequence matters because the fumigant needs to be released and start treating the space before anything else is added or sealed in. Start by applying OsmoFume so the active fumigant can disperse through the treated area. Then apply HHCB per stick so the supplementary component is in place and ready to function with the fumigation. Finally, plug the holes to seal the space, contain the fumigant, and maintain the intended exposure for the required time.

If you seal the area first, the fumigant can’t distribute properly and may escape, reducing effectiveness and safety. If the HHCB is added before or after sealing in the wrong order, it may not mix or function as designed, wasting product. Following the correct order ensures maximum efficacy and containment.