I found our policy on making saline in the home. after boiling the h2o and the jar in which it is to be stored our policy says 24hr at room temp and 1 wk in the frig.
I'm curious as to the rational of dumping saline after 24hr ( store bought sterile). in the home where cross contamination is not a concern. plain saline doesn't really encourage growth of anything that I'm aware of.
most if not all regulation are proably based off a hospital protical where cross contamination is a very major risk.