Auto Top Off

[sleeman]

I picked up a humidifier float for 10 bucks at home hardware with the intension of making an auto top off direct from the RO/DI. When the float drops, a rubber seal is opened up and water flows out. When the float moves up, it closes the seal. I thought about salt blocking it, but the fresh water should wash any salt away.
Has anyone set anything like this up? Any problems that you can think of?

Cheers,

Al