[Geoff]

i have always DIY'd mine using cheap float switches and irrigation valves, and a float valve for backup.

the one optical sensor i have, no longer works. it only lasted a few months. it was a Neptune one. i am trying to decide if i want to try another or not. i have had much better luck with the float switches. they are easier to replace if something goes wrong.

G~

 

[Geoff]

i just use the standard inexpensive ebay float switches. like these.

i have 2 of these float valves.

G~

 

[Geoff]

AvastMarine also has one.

i have a couple of things from them.

G~