Ron, I highly recommend getting a dry box. You can get them at CVS next to the hearing aid batteries for less than $5. You only have to replace every 6 months. I use this one in the bathroom, and is the one I had always used nightly in the past. My new Audi gave me a similar, yet different one with my Naida, when I asked her about getting a Zephyr. It has bead things in the bottom that you can microwave to re-activate, so it lasts longer. Plus, it's free, lol. Ask your Audi at your next tune-up, but if that isn't for a while, definitely get one from CVS. It's called a Hearing Aid De-Humidifier. It comes in a red and white box. Not using a dry box/dry store, will definitely bite you in the butt sooner rather than later. I live in the dry, dry valley of California, and even I have condensation in my tubes within hours of putting them in.