I wonder how often a setup like that needs to be replenished.
I went back and reread about bongs last night and you've definitely piqued my interest again.
Earlier this week while killing some time, I checked out the pumps available for aquariums and garden fountains, either of which would be suitable for a bong.
They're cheap ( which is a must) and readily available ( another good thing).
Shoot, you could probably build the whole thing for under $75.
Not counting the waterblock, of course.
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