Hello, I forgot if this was my first post or not but anyways here we go. Hey guys I am new here and have a question for ya. I'm not new to bongs as i've had plenty of crappy acrylic bongs but recently I went to my local headshop and finally got enough cash for a nice glass piece and I went ahead and bought a second slider as well. But there is a particular part of the bong that gets me flustered I don't know what the hell it is or what it even does for you. so my question to you is What the hell is this ? what does it do and finally how do you clean it Thank you and happy tokin.