We use the PARI nebs for Trevor's treatments. I just boil them for 10 minutes. It seems to be working fine. I would like to get a sterilizer, but the funds are limited at the time...lol. Also, I tried the fish (bubbles) mask on him and he hates it!..It seems to be a little big for him. We are using the mask that doesnt strap around his face that came with our disposable neb cups right now and I boil them, too. Has anyone else had problems getting their kids to wear the masks?