Hey guys, need some pro input on a calculation problem I'm having. First off, this design isn't speculative, I have been hired to install this system, so congratulate me The issue I'm having is figuring out my stats for available pressure and gpm. First, I ran the numbers through the hunter calculator and came out with the numbers I would expect based on my inputs which were: 3/4" Copper lines 5/8" Meter 30' from meter to poc 60 psi static pressure at hose bibs The results were about what I expected from previous design experience: 12 gpm 30 psi working pressure at heads Now, where I'm running into problems is the numbers from my design program (Pro Contractor Studio). When I place a water source on the drawing, a window pops up and it asks for most of the same info that the Hunter calculator does. When I select 'type k copper' under pipe type, I get WAY different numbers: 6.79 gpm!? 47 psi (at meter) BUT when I select type A or B copper in Pro Contractor Studio, the numbers come out similar to the Hunter calculator. Obviously my main problem here is the gpm. That can't be right, I should have 10-12 gpm available based on the fact that it's a 5/8" meter. Part of me wanted to just go with the numbers from the calculator since based on my experience they were about what they should be. However I always get nervous when 2 comparison calculations aren't close to eachother, so I wanted to see what you guys' thoughts on it were.