As above, not a good idea. TDS creep will have you burning through DI resin much more quickly and you want failsafes to avoid a flood.
I have a water station setup outside the house, near one tank that feeds that and another tank. Apex controlled. The RODI refills itself, with a TDS flush cycle, under Apex control with solenoids and optical sensors. I also use an auto shutoff valve as a backup for filling in case the inlet solenoid or upper level optical sensor fail.
I use the Apex ATK to automatically top up my stock Red Sea Reefer gravity fed ATOs (in each tank) once a day. With all the redundancy of the ATK there is no real risk of flooding the sump. I also run an optical sensor for high level sump as another safeguard, and another as a low level sensor in case the gravity fed ATO gums up.
So I never have to worry about topping up an ATO or filling an RODI reservoir manually, can leave the automation to do it's job secure that I have enough safeguards to prevent against any likely issue.
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