Jim, if your existing pool pumps is still working you do not need to replace your pump just because you are adding a salt system. However, it is a very good time to upgrade your pump to newer technology - these are variable speed pumps that use a tiny fraction of the electricity (which can save thousands) and they are very quiet as well. Plus, when you get the salt system and variable speed pump together in the package you're getting a pretty big discount for buying both at once. Let us know if you have more questions: 866-766-5243