Product review (1 stars): Arrived without a cap (Amazon Prime/Fulfilled by Amazon)
**The product works as described.**  The low review is due to Amazon Prime.  I received my first order in time, but without a cap.  This product is an environmental toxin, and as such, should *never* have been shipped without a cap (only the metal/plastic safety shield was intact}.  For reference, my cat had previously been exposed to a bacteriostat such as this, and has spent a night at an emergency vet due to life-threatening chemical burns. Upon receipt of the product I contacted Amazon and was offered the option of a return for reimbursement, or a replacement at cost.  So for anyone considering purchase, the product works as described and I have zero complaints... seriously, if you have a humidifier that you wish to remain mold-free, it's great!  But if you're purchasing through Amazon Prime or "fulfilled by Amazon", perhaps you may do better going through a different seller.  My report of a Hazmat violation raised no red flags for them, and they're expecting me to send Bacteriostat through the mail without a cap.  Really, really not okay -- says both myself, and my cat who's racked up nearly a grand in vet bills.  Bacteriostat means it kills microscopic life forms, as well as being a pretty harsh chemical.  Do yourself a favour and order from someone who has some sense.