[elkman97462]

In reading postings, using a Mag 36 pump for a 135 gal tank gives me a turnover between 20 and 30 X allowing for loss from head, fittings, etc. Sounds good so far. I have a 1600 GPH overflow box with a 1+1/2 inch outlet. The pump has 1+1/4 inch inlet and outlet. How does that feed the pump 3600 GPH and do I need another overflow box to feed it? I plan to use a closed system manifold modeled after the "short take" article Nativeman referrenced. I read a pipe flow chart that says 1" PVS at 10psi could flow 50 GPM or 3000 GPH. I am also trying to figure out if I need to divert part of the pump output back into the sump so I don't run out of water, or create back pressure against the pump. Drilling the tank is not an option as the glass guy that came to the house told my wife, he couldn't tell is back wall is tempered or not, scaring her. With the tank's age, one article said probably not, but not for sure. I will also have a spray bar system indendently on the bottom of the tank. I am anxious to start plumbing, but can't get my mind around the difference between the pump rating, and the inlet and outlet ports. To complicate it further, I called an engineer at the company that makes the mag drives and she suggested increasing the intake and outlet to 2 inch PVC. If it truly pumps 3600 (3000 at 3' head) and the 1 inch carries 3000gph for the manifold, am I good to go, or do I need the sencond overflow?
Thanks for your advice! Mike