Today I dissected the AS1 diffuser. I progressively cut the barb back to the stone and then broke the stone to follow the plastic fitting. The entire length plastic fitting was clogged solid. The clog material is black similar to the plastic. So it would appear that the ClO2 dissolved the fitting as it passed through. The stone chamber was completely clear and porous.
I don't see a remedy for using the AS1 for this purpose.
Perhaps the forced air method dilutes the gas enough to avoid the problem.
The folks who are bubbling through solid lid bottles should incorporate some safety valve of some type in the reactor . AS1 diffusers can become hose plugs!
Now - what to do with my remaining 2 AS1 diffusers - an aquarium?
I have to do something with them - they cost ~$8 ea to get them up here to Canada
Martin