I run a branch of my RODI line over 30 feet directly to my sump and use a plastic float to maintain the proper water level. As a precaution against float failure and subsequent flooding of my system with fresh water, i spliced an electronic solenoid valve into the RODI line and have it plugged into an outlet in my APEX fusion. The solenoid valve remains "open" as long as power is flowing, and i utilize 2 leak detectors placed in the sump which will "close" the solenoid valve if the water level within the sump raises above the predetermined float level.
This has worked perfectly for months and the solenoid valve was under $50.
Comments?