Quote Originally Posted by SadieKate
I appear to have lost the owner's manual. Perhaps someone else can make them operate properly.
Have you ever tried a Neti pot? I only use mine when I am sick, but I know a number of people who in the past have suffered from chronic infections and allergies. Rinsing their sinuses out daily with salt water has helped them greatly.

Neti pots can be purchased online or in healthfood/hippie type stores.