Product review (4 stars): O.K. but how about formulating to prevent yellow-orange mold
They do the job, but I sure wish they would treat them with something to retard the yellow-orange mold that grows.  I sense that the mold helps sell new filters -- as well as a separate product they sell to address that mold.  Why not just combine both products?  I would pay a bit more for that and avoid having to throw out filters at the end of every winter.