I didnt even know those existed… i was just going to figure out a float with the contact sensors.
this might be an option… I think the biggest problem going to be getting them in the hole… my original thought was to just hang the sensor on a string about 3 ft from the bottom so when it fills it triggers my switch to turn the pump on… Concrete hasnt been poured around this pit yet, so I plan to leave the pump in the hole with a notch under the skimmer lid that will cover this thing…