aso valve

Hello, I am absolutely new to all this, just purchased a Red Sea 200 XL G2, 2 weeks ago. So the issue that I am having is with the RODI System its a AQUATICLIFE Aquatic Life RO Buddie Plus DI Four Stage Reverse Osmosis Deionization Unit 50 GPD I have attached a diagram of how they want the...

I have been using an ASO valve like everyone else but my Permeate pump died and I decided to just get a booster pump. I have a pressure vessel that is filled by the system with Ro water. The problem is I have varying low water pressure from the municipality and sometimes it goes down so low...