Quote:
Originally Posted by microfarmer
If you do make your own proportional system, please post the assembly process. I would love to see how these work inside...
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There are several different engineering approaches. All of them involve either a pressurized tank or a moving part (to prevent backflow into the tank). Some of the designs make use of vortex flow to draw from the tank, while others have a fly-wheel or pump. Dosatron happens to use a pump. Here's a great illustration:
Dosatron - How It Works