I have used this design as a bubbler for many years and have found it to be the easiest way to keep the system clean. If it gets too dirty, just toss the used bottle in the bin, soak the stem and tube in isopropyl alcohol a little, rinse it all out, fill the empty pop bottle halfway with clean water and beep-boppity -boop, you're back puff puff puff. I would highly recommend this type of smoking system to anyone who wants to make pipe cleaning easier.
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