Auto top off in all-in-one location

[KnH]

I have a Micro Smart Auto top off with an optical sensor that is help in place by a magnet

where is the best placement?

 

thanks

[SeaFurn]

You’ll need to put it in the last chamber where the pump is located. That’s where the water level will drop when it evaporates. When it drops below the level of sensor it will trigger the top off. 

[KnH]

Thanks