This is a laundry booster from Arm & Hammer. Sodium carbonate, not bicarbonate – a stronger alkali than baking soda and used in smaller amounts.
It earns its place in hard water, and stripping built-up detergent residue out of towels. 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.
