How often do you change your balsa filter? Every bowl, every x bowls? How long do you wait after smoking until you take the stem out and clean the pipe? A day, 10 minutes? I understand it needs to cool off, but I'm curious if it matters if one waits a couple days. Do you find any problems from leaving a moist filter in the shank/stem after smoking? I've been smoking for a couple months now, and love my Savinelli's. I'm interested in hearing how others care for their Savs. Any tips or advice are welcome!