I'd like to buy a different more reliable water pump that I can set up with my wet dry filter with PVC. I found a classic mag drive pump with threaded in and outflows but the slowest GPH they offer is 500 GPH. My wet dry filter is rated for 300 GPH. So I figured out that a ball valve would allow me to restrict the flow and slow down the new pump to 300 GPH. But, my question is, would the ball valve damage the water pump since its restricting water flow out of the pump?