Can you use a pump that was on a cartridge filter for a sand filter?

Yes, you can typically use a pump that was previously used with a cartridge filter for a sand filter, as long as the pump's specifications are compatible with the sand filter's requirements. However, you should ensure that the pump’s flow rate and horsepower match the needs of the sand filter system to ensure optimal performance. Additionally, it may be necessary to adjust the Plumbing connections to fit the new setup. Always refer to the manufacturer's guidelines for both the pump and filter to ensure proper compatibility.