Is it true that you should double the size of the pipe when using a mag drive pumps? For example my mag 9.5 is threaded for 3/4in should I use 1.5in? Really confused right now. Thanks, Colin
Yes, that is absolutely true. Going smaller will restrict that pump; it will run hotter; and it will not produce the promised GPH through narrower ID pipe. Go larger, and then reduce it down where you must (at the bulkhead, or at the top of the tank where the water pours back in).
I second that. My Mag 7 is 1/2 inch on the output and I have 1 inch PVC all the way up to the loc-line for my return. It runs cooler with less restriction.
Awesome thanks for confirming this.