Pressure pumping question
I just got my new kaplan pump in the mail today and I am quite pleased. It’s good quality and only cost about 67 dollars including tax and shipping. My question is how much pressure can you take? The instructions say keep it between 5 -10 hg, but I’ve read on here that some guys only do 5 hg. So whats up? Can I go higher than 10 or is that pushing the limits?