Well, we use both the Atrium and the Glass Bottles ( and yes, I was referring to UWSD as the Under Water Seal Drainage), just depends on who the doc is. But when I work with the Glass bottles, the higher the level of fluid gets inside the bottle, it takes a longer time for the fluid to drain from the CT, causing it to build up in the straw that is under the water seal and the chest tubing. So to drain the fluid that builds up in there, I unscrew the lid of the glass bottle and lift the straw slightly up from the water seal until it starts to drain the fluid again but quickly put it back under the water seal when it gets close to draining the fluid that builds up in the CT so that I don't get any air into the CT. My question is that is this a bad practice to be doing, and if so, what are some other ways I can use to help to drain the fluid from the CT into the glass bottle? Sorry if this confusing to you guys!