Appears there is a typo.
The page is taken from
https://www.amazon.com/Are-You-Ready-Depth-Preparedness/dp/1510750770Which reads
"Other chemicals, such as iodine or water treatment products sold in camping or surplus stores that do not contain 5.25
to 6.0 percent sodium hypochlorite as the only active ingredient are not recommended and should not be used."