Hi MM,
the original switch had to be fully submerged for it to operate and it is 240 volt so it had to be sealed 100%. They way I have set it up now the switches are above the water so if I had to go to the mercury switches then I may be able to use this setup and do away with the magnetic switches. The only issue with it all is with normal the 90mm outlet from the tank can handle it but when we get a downpour for half an hour it floods the tank and lifts the lid so the switches are fully submerged during these events. Going to have to put another outlet pipe in the tank to stop this happening
