Have you looked into the non-mechanical switches?
http://www.aquacave.com/detail.aspx?ID=254
I'm thinking about replacing my switches with these.

Bert

wrote:
MarkW wrote:

I have a top off system for my fishtank that I have a small pump in.
Unfortunately the old float sensor is no longer working so I have to
get a new one. Obviously it's important to be reliable. What is a
good brand to go with? I have seen Ultralife and Reef Fanatic looks
very nice.



I've used the ultralife for several years without any real problems. Has
been very reliable for me.

Bob