These are in the bottom of DD's humidifer everytime!! When you touch them they crumble ( and are kinda crunchy like a leaf) at first I thought it was just the humidifer filter but we have used it 10 times and it seems like there are more of them.
TIA
p.s. cleaning out a humidifer is the biggest PITA ever!!
Re: Any guesses??
Not that I have noticed
I'd wager it's the carbon from the filter breaking down.