[framerguy]

I'd like to take the opportunity to say DON'T HOOK THE RO/DI TO YOUR TOP OFF TANK! Hook the RO/DI to a resevoir how ever large you like, use an ATO to fill it but have an emergency overflow above the level of the sensor plumbed into your drain system as a backup for WHEN the float sensor fails. Have a seperate ATO resevoir for the MT that you fill with either buckets, a plumbed line with a valve you open by hand, whatever you like but have a FINITE amount of water that won't overload your system with FW in case of a malfuntion. It's not that much trouble to fill the ATO resevoir once or twice a week. There, that's my two cents on that!