If you're looking to build a new pool or simply looking to replace a pool pump you may find yourself asking, "Is a larger horsepower (HP) pool pump always better". PRO TIP: No matter which type of pump you choose, you’ll want to make sure you properly select the correct pump and filter combination. The pump needs to be sized appropriately compared to the filter’s flow rate. Choosing a pump with a higher flow rate than the filter will put strain on both the pump and filter, reducing life and efficiency of each. This means that you would not want to choose a pump designed to be used with 2" plumbing piece, and then use a filter designed to be used with 1 1/2" plumbing piece. Proper pairing of these two units is essential for a pleasant pool experience. For example: √ If choosing a pump with a 1-1/2” inlet/outlet, you should choose a filter with a 1-1/2” inlet/outlet as well. However, a pump with a 1-1/2” inlet/outlet can work with a filter with a 2” inlet/outlet if needed to. X You would not want to attempt to use a pump with 2” inlet/outlet with a filter that has a 1-1/2” inlet/outlet as they would not be sized correctly or efficient when used together. You can also learn more about Single Speed and Variable Speed Pumps Here! While outside of this simple yet extremely import we get asked a lot about what HP a pump should be. That being said, it's important to know that pool pumps should really be rated by the gallons per minute of water flow instead of the motor's HP.