Oh Man...was I out in left field or what!? Thanks for the great pic...that's a big help.
Looks like 2 different types of float switches. Is the upper switch an optical? Would that be more reliable interms of auto topoff with the float as the back up? Thanks again.
The opticals will not suffer from wandering snails etc deciding to take up residance. They also require less in the way of maintenance.
The upper is the optical. Having two sensors allows for various other types of water level choices, have a look in the manual for what all set ups can offer you
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