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    Undersized pump for pool and spa

    Hello, I have a 18,000 gallon pool and a 360 degree raised spa with spill over that share a single pump. Even when I run my pump at 100% (3450 rpm - 56 GPM) all the sides of my spa do not spill over. This is with the valve open 80% to the spa and 20% to the pool main body. Would the Francis...