boiling nebs and water?

We had a water issue in toledo ohio about microcystin bacteria in the water so we are not able to use our tap water. So I boiled my nebs with gallon water I got at the store and my nebs have a white powder substance all over them. How do you boil your nebs? What should I do now?
Source: Cystic Fibrosis Airway Clearance Techniques Forum - Category: Respiratory Medicine Authors: Tags: Airway Clearance Techniques Source Type: forums