A stillwell/siphon system may be attached or integrated into a foam delivery bucket. When pouring foam additive into the bucket, foam/bubbles may form in the foam additive. The stillwell may fill from the bottom to prevent the foam/bubbles from getting inside the stillwell tube so one can easily ascertain the level of foam in the container. The stillwell also blocks air pockets, formed from pouring foam into the container, from entering the outlet tube, which is positioned inside the stillwell.

A siphon includes a feed area for feeding a liquid, a downpipe connecting to the feed area, extended from top to bottom in a use position of the siphon, a deflection pipe filled with liquid during stationary operation on the end of the downpipe facing away from the feed area connecting to this, a riser pipe on the end of the deflection pipe facing away from the downpipe, and connecting to this, extended from bottom to top in the use position, and a discharge area connecting to the end of the riser pipe facing away from the deflection pipe for discharging liquid. A storage tank arranged on the siphon between the feed area and the discharge area is hydraulically connected to the deflection pipe and designed to automatically fill with liquid during stationary operation and to automatically empty into the deflection pipe following a pressure surge affecting the siphon.