Miss Israel has a chest tube in place for a spontaneous pneumothorax.

1. 
   
2. You note that the water seal chamber is bubbling vigorously. What could cause this? What should you do?
3. 
   
4. You are totaling intake and output for your 8-hour shift. There is 240 mL of serous fluid in the drainage chamber of the drainage system at 2200. At 1400, there was 190 mL. How much output should you record?