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Anyone know where I can get a low cost, low power(1) solar pump,

It will be used to pump hot tub water(salt) or glycol 9feet vertically, than through an accura radiator in a thermal box and return to tub or another exchanger in tub. I don't know what kind of backpressure I will experience but maybe 10psi? any guesses. Most pumps I see are about $100. I need a lower cost. Thanks good luck