Now you have to post your cat-proofing system. [/quote]

The fact that the process contains water is (I suppose) a kind of "intrinsic safety." Though both cats and birds are drawn to the sound of dripping water, with unpredictable and volatile results.

As long as Blast can incorporate one of those "fake fluid-filled birds that bob up and down as if they were pecking seeds" (what the *&%! are they called?) as part of the vacuum breaker system, I will be satisfied. But seriously, ETS-ers, we must be able to come up with a more complex way to do a simple task ... !?