I have 3 of these and I had to repair one of them so I have been in one of them. They have a switch that opens allowing the soap mix to flow out of the tank. Mine use gravity feed method to flow. The hose is hooked directly in front of the blower output side of the fan. It works like a ventrui creating a vacuum and sucking the soap into the sock. The sock is attached to the end of the blower at the same point the hose is attached. You could use a water switch from an old dishwasher or refrigerator to open the flow and put a tank above the hose hooked to the output side of a shop vac with a sock made out of a pair of panty hose. That is about the same type of material. I don't have any pictures but they are part of my display and I will be controlling them with a hockey puck type of SSR for this years show.
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