Product review (5 stars): Best deal on this
I have been using this in my while house humidifier for 3 seasons now. Keep it away from your food and your kids and respect it while handling and you'll have no problems. Makes your filters last way longer and keeps the inside of the machine clean and "gunk" free. This bulk box should last me several years. Tip: have a dedicated measuring spoon for this purpose....trying to use the cap is just asking for trouble.