Pool and Spa
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Priming the pump just means to allow any air that is trapped in pump to escape. Open the skirting on the spa to expose the pump then loosen the union on the front of the pump and allow water to leak out for 10 seconds then re-tighten the union and turn the spa power back on.
The pump that supplies water to the heater is the one you want mainly, but you can do this to any pump you find inside.