I once brought a lightly used tank on a second small trip the following weekend.
Folks were not overly impressed and it was all guys.
In pretty sure TEW held in til the take out.
I also once left a full tank to season for the winter. The clean out crew didn't even notice that there was a third tank to clean after a two tank trip in the spring.
The Rio Chama actually allows a bucket with a paper bag and sawdust to be used and dumped at their facility, or at least they did about 10-15 years ago.
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