How to Replace Your Pool Pump Without Calling a Plumber

Before you start: turn off power at the breaker (not just the timer), and confirm your replacement pump has the same union fitting size as your old one — 1.5" and 2" are the two common sizes, and mismatching them means extra fittings. 1. Shut off power at the breaker and close the valves on either side of the pump. 2. Disconnect the unions on the intake and discharge sides — have a bucket ready, some water will drain out. 3. Remove the old pump from the pad and set the new one in its place, matching the same orientation. 4. Reconnect the unions hand-tight plus a quarter turn — overtightening cracks the fittings. 5. Prime the pump with water before restoring power — running a pump dry destroys the seal within seconds. 6. Open the valves, restore power, and check for leaks at both unions over the next 24 hours. If your old pump's wiring uses a different voltage than your new one (some pumps ship dual-voltage but arrive wired for 230V), you'll need to rewire the pump's wiring compartment to match — consult the pump's manual for the voltage-change diagram, or call an electrician if you're not comfortable with it.