Quote Originally Posted by rabernet
it breaks down very quickly.
Acutally this is NOT true. According to Sigma (the patent holder)

"Dilute chlorhexidine solutions may be stored at room temperature, and a shelf-life of at least 1 year can be expected, provided that the packaging

is adequate. "

The issue is not breakdown of the potency but the potential for microbial contamination due to non-steralized water being used.

Here is the entire PDF from Sigma for those that would like to read it.

http://www.sigmaaldrich.com/sigma/product%20information%20sheet/c9394pis.pdf