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allan's cool.

not an airlock, but rather a clever way to dump the waste stream into a trash bag or other container............

Weight won't work.

I know of 3 methods.

Go to the Laguna manual on this link. Page 7 - item V
...

Exactly right.

The advantage would be a drum of whatever size, without a lid of any kind, and a trash bag for a liner.

The debris simply falls down into it, pull the bag and replace as needed....