A 150 GPD Water Saver Upgrade Kit can double the product water output of a standard 75 GPD membrane without increasing the waste water output. Installing them is pretty simple, but with all the tubing and fittings it can get confusing quick. We highly recommend taking a photo of your RODI systems plumbing before disconnecting any plumbing for a reference. The 150 GPD Water Saver essentially takes the waste water from the first membrane and refines it one more time, getting the maximum amount of product water out of every drop. Since the second membrane is fed from the first, there is a slight pressure drop and could cause a decrease in performance and rejection. To combat the decrease in pressure, a booster pump kit along with a pressure gauge will be able to get your RODI system right in the sweet spot of 65 PSI.