Pumps should be sized to the pool plumbing, filter and size of pool. Newer pumps are much more efficient than older pumps (old brass type pumps) that were installed just 8-10 years ago. Because of the more efficient pumps, plumbing is usually too small in size to let a larger horsepower pump prime up and operate at its full potential. In most cases it actually moves less water than the older, smaller horsepower pumps. If the plumbing and number of jets will allow the use of a larger horsepower pump, you need to make sure that the filter is large enough to handle the extra force/pressure that the pump will create. also you do not want to have so much flow in a pool that it becomes unsafe. The ideal solution to this question is to add a variable speed pump to your pool. What that means in a newer money saving efficient Magnet Drive pump.
