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Chris, It has not been moved recently. The unit is 8-10 years old and taking off the cover doesn't really make it clear whether it's the impeller or the motor. I see there are couplings connected. Is the next step to pull it out at the next water change? Are there bearing kits available?

Thanks guys

It sounds like it's excessive, but I'm new to all this and the spa is new to me. What you are hearing is pump 1 (noisy to me) Then pump 2 on low speed, then on high speed (all sounds normal and functions fine,, Even when it sounds like it's just humming) Then pump 1 again...