How much does this cost to the nearest dollar?

Berkey Biofilm Drops Extend Shelf Life of Stored Water—for Use with Long-Term Water Storage Containers, Ideal for Emergency Preparedness
Product Description Berkey Biofilm Drops extend the shelf life of stored water in long-term storage containers, making them ideal for emergency preparedness. One bottle of Berkey Biofilm Drops treats up to 330 gallons of clean water and extends its shelf life up to 5 years—eliminating the need to rotate your stored water every 6 months. Berkey Biofilm Drops are not intended to kill biological contaminants or purify water; rather, they are scientifically engineered for use in defense against the potential growth and buildup of biofilms, which protect pathogenic microbes from disinfection by creating a slime layer that can spread inside water storage containers. Berkey Biofilm Drops

Price is $41.00
Price: $41