You will most likely need to upgrade the pump... I upgraded a system last year by adding a second membrane (30"x3") and had to upgrade. The new pump head was only 160 bucks but I went from 5GPM to 12GPM...
I have a contact for RO supply, parts etc... if anyone is interested, PM me. These systems are pharma grade but this company sells used items and can source just about anything for the best price...
Had to sell my property or I would be making syrup too... it was work, but well worth it. I'll be buying syrup this year