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Add up the total capacity feeding the pump at any one time and
you will find out the maximum flow rate that you should look for in a pump.
In the diagram at the left, the system has two inch piping.
While there are three pipes coming from the pool, there is only one coming from the spa. That fact limits the maximum flow to 78 gallons per minute. The
flow on the return side is also limited to the same 78 gallons per minute.
In reality, it is not as dangerous to exceed the capacity of
the piping slightly on the return side, the pipe sizing MUST be correct on the intake side or the pump will not operate properly.
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