Easy R.O solution - for people that constantly forget about the water

[Delphinus]

These work fine but you need to take into account it's just a timer. It won't prevent a flood if the vessel you're filling gets full. You should still be putting a solenoid shutoff valve on the RO unit if it's not already there.

What IS nice about timers though is that it can be used to change the cycle time of the RO unit. RO units work better with a long run time rather than lots of little on/off cycles. So you use your timer to say run for an hour or two each day and poof you're set.