Based on the numbers I have been able to get, Schd 120 PVC is only good to 360 psi in 1", and only 2 hp. We would just get by at the 360 PSI number, but not with the HP. For 5 hp, you have to go up to 2" , and then the PSI goes way down to the 200 range. I know people fudge these specs, but...