You need to be careful considering the output of mag pumps. They are notoriously over rated, and they lose flow under any sort of pressure. With becketts, and i suspect with these mazzei injectors also, it's the pressure performance of the pump that matters. For example, my small skimmers work MUCH better with an iwaki 40rlt (750 gph) than a mag 12. ("rated" at 1200 gph) What you want is steady flow under changing pressure; as the water has higher organic content, more bubbles are produced, and the drag increases. With mag pumps, this causes the water to slow down as it goes through the injector, exactly what you need to avoid.