I have 16 nebs. Sounds like a lot but I don't want to be washing every night since I do the hydrogen peroxide sterizing - could get pricey - wash twice a week approx. I write the date that I start them since they are only good for 6 mo. (Pari LC Plus) then on the one's I use for Pulmozyme I write P 02/06 with Sharpie and then I know it is a Pulmozyme neb and started in Feb. '06. Works for me. Those that wash every night - how do you ensure a dry neb the next day? I find my nebs take 48 hrs. at least to be completely dry. Oh and I've tried putting them in a warm oven to dry them before use and I wouldn't suggest this <img src="i/expressions/face-icon-small-smile.gif" border="0"> I guess Polypropylene has a low melting point...