I'm with fkshiun on this one! If you pump 500 gph through a 1" pipe you will get a lot more psi coming out the end than you will if that pipe was 4". That's not difficult to wrap the brain around. However, it is much more difficult on your pump to pump the water through a 1" pipe than though a 4" pipe because it will have to work harder because of the resistance.
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~ Mindy
SPS fanatic.
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