Quote Originally Posted by JimD View Post
Probably the best piece of information so far.
That applies to whether you are running 1 1500gph pump or 100 15gph pumps. The total water volume is the same either way. Only difference is if one pump fails, the total gph reduces going into the tank, but so does the gph draining from the tank. Again, it's the same amount of water and the same amount of space holding that water.