Don reminds me that I need to get a new Water-Pik. It's the best thing going for getting the snarf out of the safety razor when the whiskers have gotten a little longish between shaves, so you don't have to replace the blades so often. A 15% improvement in blade usage life should pay a Pik off in a few months.
(Or maybe I should just go back to the straight blade that I used when I was 13, until the Army took it away from me. Unfortunately, I haven't found a place to hang the strop in our new dinky bathroom.)
With respect to the neti pot, the implied warning that one should be especially cautious with the fluids used whenever there's more than usual "irritation," or any drainage showing blood or other evidence of "internal injury or infection" might be worth specifc note. It would be reasonable to assume that an "injured membrane" would be more susceptible to any potential infection. With normally healthy (even if congested) membranes, the risk of using less than pure and sterile solutions is probably fairly minimal, so it's a matter of doing what you feel safe with at the time.