Where should foam containers be staged relative to the eductor?

Where should foam containers be staged relative to the eductor?

• A. Caps on
• B. Caps off
• C. Lids on
• D. Caps sealed

Answer: (B)

When feeding the eductor, the foam concentrate must be vented. The eductor creates suction that pulls concentrate from the container, so air has to escape as liquid leaves. If the container is capped, air can’t vent, a vacuum forms, flow slows or stops, and the foam concentration can become inaccurate. Keeping the cap off provides a vent path for air and any vapors, allowing a steady draw and proper mixing with the water stream. That’s why foam containers are staged with caps off during eduction, and the cap is replaced when not actively feeding.

When feeding the eductor, the foam concentrate must be vented. The eductor creates suction that pulls concentrate from the container, so air has to escape as liquid leaves. If the container is capped, air can’t vent, a vacuum forms, flow slows or stops, and the foam concentration can become inaccurate. Keeping the cap off provides a vent path for air and any vapors, allowing a steady draw and proper mixing with the water stream. That’s why foam containers are staged with caps off during eduction, and the cap is replaced when not actively feeding.