... well water on a float valve right?
Yes.
Can you verify if the bales were from the same source? Was it entire years, or maybe just during a certain weather periods?
She uses small packets of barley straw sold just for troughs - maybe the size of a football. And they get reused, so that they might be 3 years old sometimes. (Can't verify source due to sporadic purchases.)
Last year it was a new one, and it didn't work real well. IIRC there has been some info that "moldy barley straw" controls FA - maybe that's why new straw last year was disappointing..