The problem with the non-mechanical device is the water level must drop 1"
before the switch turns on. I have the reliable Ultra-life float switch
which kicks on when the water level drops no more than an eighth of an inch.
It may be better for the aquarium environment if the fresh water is added in
much smaller amounts.
"Roberto Quijalvo" wrote in message
news
Why replace them if they're working?
To find something more reliable. Just because they haven't failed yet,
doesn't mean it won't. There are countless tales out there of
failed mechanical switches. I don't have to personally experience the
failure to prompt a change.

Of course, that's not to say that the non-mechanical switches may not have
their faults too.


Pszemol wrote:
"Roberto Quijalvo" wrote in message
...

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.


Your mechanical ones do not work ?
Why would you like to replace them ?