Eco;

I'm sorry, but we treat commercial pool questions at a lower priority than other questions, for reasons I've explained in other posts in this section.

I'll ask mas985 if he wants to take a look, but like I said, it's not a priority.

I will offer this: I've worked with Pentair / PacFac TR-140's many times, with various optimizations. On a 36" filter, with 2" piping, 100GPM is the usually upper PRACTICAL limit. More than that, and flow losses are very high, PLUS filtration quality deteriorates. You're getting much better filtration at 80 GPM than you would at 140 GPM!

For 6 hour turn-over, your pool needs FIVE or SIX 36" sand filters, fed off of, and discharging into, 6" or 8" header piping. If you've got the typical home-pool-builder 2" PVC spaghetti . . . well, you've got a mess.

If you want professional help, come September, I can probably work with you, but at rates over $100/hr.

Two more things:

1. If you are doing this for code compliance, 140 GPM is NOT the commercial rate for those filters, and if your inspector is on the ball, he won't accept flow achieved that way.

2. If you are seeking better water quality, well you won't get THAT, either for the reasons mentioned earlier.