Product review (1 stars): burns my head
The price was cheap, but the pad is coated in a blue dusty caky chemical that gives off a smokey, dusty, metalic, chemical smell when the heat is running, and burns my sinuses and hurts my head. I've tried washing the blue chemical off but the burning smell remains.  I read another review on the product where the person said if they didn't change the pad twice a season, if would fall apart to the degree it clogged their sump pump.  The blue material may be to keep the pad from deteriorating, though it says it aids evaporation.  I'm looking for another product, even if it costs a little more.  Not satisfied.