I just did a search and there are lots of complaints about the pump and the customer service. But what i read is you adjust the pressure with the bypass valve in the middle. You open or close till you get the pressure you want, not sure i have plenty pressure in my house so i dont have one. Someone here has to have one. Try the bypass valve.
What's the "bypass valve"? Sorry, I really do not know.
And I have a pounding headache from this stupid cold hubby handed down to me.