[mike31154]

My RODI came with the ASV that's pictured in Mindy's post. I could never get it to work properly from day 1. No hammering issues and the mechanical float valve shut the product water off just fine, but the ASV would continue to allow waste water through. Last year I decided to remove the darn thing since I never used it anyway. I only make water when I'm home, don't trust automation, fear of flood, so ASV is redundant in my case. After removal & a bit of replumbing due to the now absent ASV, I happily found a reduced pressure drop between source water input & RO membrane input (meaning more pressure present at RO input). This should make the membrane more efficient, or at the very least increase production rate of pure water. Difficult to tell for sure since product rate increase I've experienced isn't documented, but in the end, I'm glad to be rid of one more piece of finicky hardware.