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I assume that if you are switching 12VDC for the pump, then you have the 12VDC available to drive the coil on the switching relay. The pump current determines the minimum size of relay you will need.
What's the project...reeds as part of float switches?
You're right that a reed switch will not handle the current required, even for a small 12V pump. If you reduce the voltage/current to the pump to a level that the reed can handle, the pump won't work. That's why you will need an intermediate relay. The attached schematic is a switching circuit that should do what you want, but that relay is rated at only 2 amps. If your pumps draws more current you would need a different relay and other component values.
Here's a toggle switch that turns a relay on and off when a push button is pressed - once for on, once for off. i suppose you could replace the push button with the read switch.
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