I would suggest using two electric float valves wired in series with one mounted slightly higher than the other in the sump. Run the float valves in series with a rainbird sprinkler solenoid valve and 24VAC transformer. The current draw on the valve is less than 1A so you don't need a relay. A couple bushings to reduce the 1/2" or 3/4" valve input and output to 1/4" will be needed. Run the transformer on a regular digital timer for added safety so it can only be activated to set amount of time. Whole system should run you around $80 to $100.
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