How many psi do you have coming in ? I believe they call for 65 psi and above to the 1st membrane right? I sit at right around 55 and have been wondering if I could get away with it that or would need the booster pump. I have already purchased the second membrane kit needed to upgrade my 75 GPD system to 150 GPD , but have held off installing due to possible low pressure.
So I get 60 psi but maybe I do need a pump?
I will keep monitoring it. In the winter I get less.