I appreciate any help on this. Too white and loose to be creosote? We're new to wood burning stoves and just moved into a new place with a Defiant 1610 installed in a fireplace. Have gone through about two weeks of using it, and just discovered this pile of gray "rice krispies" behind the stove. I call them that because each grain is about that size with similar texture as the cereal. Crush it with your fingers and it resembles ash. We hear a raining noise every once in a while, and I assume it's more of it coming down. Ash in the bottom tray is nice and fluffy. We've stopped using it until I know what this is coming down the chimney!
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