SOURCE: Culligan Super-S model 405AA38-556 C
It normally is under pressure. There is a "check ball" in the tube to prevent water from coming out of the tube in service. The feed tube has to be flooded with water in service position so when system goes in to draw cycle vacuum is created in the tube to draw bleach. You may have a plugged eductor assembly or feed tube may be restricted.
RJ
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