ATO tech refused to advance much over the past decade because its stuck as a volume maintenance device and not a salinity maintaining system. most will agree volume can now be very reliably maintained with the float-magnet-optical sensor triple safety devices out there. but what about true salinity maintenance- like a salinity probe, controller and 2 ato devices, 1 in RODI to bring salinity down and 1 in new salt mix to bring it up. A sump camera would help too. I know, keeping it simple keeps it safe (boring), but it could be more "automatic."