I have a pump that I keep in a large vat of fresh water. Every few days I turn the pump on in order to topoff.
I have a large 450 gal
setup so I loose alot to evaporation. Also, my sump is in a hotter room than the main so I keep one of the panel complete off the top of the main.
I know it sounds like I should never forget that the pump is running but it has happened and I ended up dropping my salinity to sharply (and minor flood). I work out of my house sometimes so distractions are common.
Anyway, what I am asking is does anyone know of a device that I could set a timer on (say 1 minute) and the electric would cut off after that time?