When picking out baitwell and livewell pumps, start by considering the size of your tank and the type of fish you plan to keep. A pump's flow rate, measured in gallons per hour (GPH), is crucial; generally, you want a pump that can circulate the entire volume of your livewell at least once every hour, but more is better for keeping bait lively and healthy. Next, think about the pump's power source and durability. Most pumps run on 12V DC power, which is standard for boats, but make sure to check the amperage draw to avoid overloading your system. Look for pumps made from corrosion-resistant materials, as they'll stand up better to the harsh marine environment.