Sorry, Russ, but I TOTALLY disagree. Just look over these posts, and talk to people about RO/DI systems. Many get disgusted because they can "...never get it working right...". Destroying a membrane and the DI resin just to save a couple of $$ on water? Give me a break. I'll take the non-adjustable every time - and I couldn't possibly recommend the adjustable type of restrictor to ANYONE.