This is a moisture absorber from Arm & Hammer. Calcium chloride pulls water out of the air into a sealed reservoir you then throw away.
It earns its place in wardrobes, basements and boats – anywhere air sits still and damp. Compare it on how long it lasts rather than on what it costs the first time — that is usually where the difference shows up.
Arm & Hammer is a Church & Dwight brand; the company runs US plants at Green River, Wyoming and Old Fort, Ohio for baking soda, and at York, Pennsylvania and Victorville, California for laundry and cat litter.
