We currently use sterile water in our Fisher & Paykel Bubble CPAP system. We have noticed a lot a rain out lately in our circuits, with some of our infants getting "lavaged" at times, and are somewhat worried about infection. What liquids are other NICUs using in their BCPAP systems - 0.25% acetic acid, vinegar mixed in the water, etc, and has any one noticed increased infection rates because of this rain out in the circuits?