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ANY MONKEY CAN RUN!
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Well if its a low voltage DC motor you build a PWM drive Like a H bridge or buy one .

You can control the gallons per minute by adjusted frequency of the speed to you amount of flow need in that time span . Digital IC Timers can be added to you control of drive time .Also the H bridge can be used as a break meaning stop or reverse direction .

Resistors are old out of date and wasted power plus it doesn't matter what application its for speed and time is what makes it work on anything .
 
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