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spa/heater/pool pump

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I have a pool with a regular Hayward Superpump, a spa pump and a Hayward millivolt heater. The spa is one of those ones built into the pool deck and the pump for it has its own switch on the wall.  My question is....When I turn on the spa pump and heater and change the direction of water flow, am I supposed to turn OFF the "main pump" and only let the spa pump run?  I could swear the former operator told me to always leave the pool pump running even when heating the hot tub  but when I tried that tonight there was banging in the pipes and shaking so I had to turn it off.  I must have misunderstood or maybe i did it in the wrong order.  I would greatly appreciate it if someone could set me straight.  Thank you.

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