FLOAT SWITCHES

I think Marc's website has some detailed instructions on how to make them - and where to get them from. Do a google - Marc Melev (float switch).
 
Good grief! Did you even try?

Here - http://www.melevsreef.com/plumbing/auto_topoff.html

I like where he says - "I use an electrical float switch that can be purchased online for $6 plus shipping."

Marc suggested - http://www.aquahub.com/store/ifloatfloatswitch.html

There, now I have done all the work for you.
 
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