There is no way to convert the pump motor (you would have to change the windings) and you will lose performance if you run a 220VAC motor at 110VAC. However, ALL houses that I know of in the US do have 220VAC available at the fuse box and usually at several special purpose outlets (air conditioning, clothes dryer). To "convert" 220VAC to 110VAC or 110VAC to 220VAC you only need a 2 to 1 power transformer. Simple, fairly efficient, and they can be found at new and used electronics parts distributors.
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