I saw this in a catalog the other day advertised for a sump pump overflow alarm. It is like a smoke alarm, only for water! And I got to thinking(I know, never a good thing

), why can't I use this in case one of my filters starts to leak, or my tank springs a leak? I really don't want 240 gallons of water on my floor.

It is very inexpensive, and you just have to replace a 9V battery every so often(like when you replace you smoke alarm batteries). So I am thinking about buying two, one for inside my stand, in between my two Fluval FX5's, and one outside my stand, on the flood somewhere.
Here is the 9V one I saw...
http://www.northerntool.com/webapp/wcs/ ... _200342360
And here is one I found a little cheaper, that runs on two AAA's...
http://www.internet-security-inc.com/ca ... _id=848131
So what do you think? Is it worth it? I mean you have to be home to hear the alarm anyway right? But what if you are home, and you don't notice it leaking until hours later? I think it would be invaluable then. Don't you?
Thanks for any advice,
Nathan.

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RES's
Tank, SCL 3.75in.
Diesel, SCL 3in.