Plaster pool finish or ? I'm curious, what is the filter tank pressure? ( I bet it's high ) your pump is sized to the spa , usually on higher end builds a separate jet booster pump that only when needed provides the high h.p. for maximum jet therapy action, and does not share pool circulation and filtration duty, this would be achieved by pump 2, a 1hp pool circ pump to be used for normal day to day operation, that sits next to the 2 hp jet booster pump. Because you share one pump for both pool, and spa, a builder will make sure the pump will be sized to the spa, because if he doesn't, it will almost be a certainty your complaint will be about how there is no, or very little, spa jet pressure when you use the spa, in the long run you will pay out the nose in monthly utility bills running that monster 2 hp pump as your circ pump, compared to a 1 hp pump, the curve chart on that beast i figure to be medium to high head, which translates into a noise maker indeed, when considering its usual role as a water feature pump, or spa jet pump, noise wouldn't be an issue due to the fractional amount of use when compared to a normal circ pump role, now without laying eyes on it, its impossible know exactly, but im sure you can understand now, the pool builders dilemma, if he installed a 1 hp pump. I notice the filter is bare minimum size, and if your pool is plaster that means your plaster dust conditions will clog the filter capacity in no time as a result of the new start up, so while that pump is perfect for the spa, it is absolute overkill for a daily circ pump, which 95% of the pump will be used for, normal circ, or filter pressure is 10-15 psi on a clean filter, where is your pressure at now? 20,25,30psi? im just curious