this post was submitted on 02 Jan 2026
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They have a thin plastic mesh in the pump mechanism that does the foaming. If you refill it with a mixture that is to viscous, the mesh can break and the pump won't foam anymore.
Also, putting too much water in will temporarily stop the pump from working. The device needs a reservoir of air inside as well. If the pump mechanism gets flooded it may need to be left to dry out before it is usable again. Trying to force the pump when its flooded can also break it.