I put this in the bottom filter of a Penn Plax Bubbler with gravel on the bottom and it FLOATS. I've been using this bubble box with a different thread for years with no problems and decided to try this product because it was cheaper. It's also made up of fine, filament-like hairs that can break out of the box and eventually wrap around your outboard stern filter's impeller/motor. NOT GOOD. I chose shredded quilting from Poly-fill because it sinks when wet and doesn't have any fibrous hairs. I had enough to make a king size blanket from Walmart for less than $10.
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