Need to run a 20 amp breaker 225 ft for a pool pump what gauge wire do i need?

For a 20 amp circuit running 225 feet, you should use at least 10-gauge wire to account for voltage drop and ensure safety. If the installation is in a location with high ambient temperatures or if multiple circuits are bundled together, you might consider using 8-gauge wire to further minimize voltage drop. Always check local electrical codes for specific requirements and consult with a licensed electrician for proper installation.