Sad news, Dusty had a catastrophic implosion today, I'm afraid there is no hope for survival.  

I guess the vacuum is too strong for the bucket to handle.  It is probably made worse by the two different sized hoses I'm using causing a stronger vacuum draw on the bucket.  I'm also using a lid with a seal on it, things may be better using a cheaper lid with no seal so some air can leak.

Anyway I'm going to use two buckets stacked together to try and add strength.  If that does not work then I may drill a small hole in the lid to reduce the vacuum draw by a bit.