I bought some HASA 10% chlorine from a local pool supply store here in Phoenix, AZ. They told me the manufacturer of the chlorine usually produces it at a higher percentage (around 15%) so by the time it gets transported, put on their shelf, sold, and used, it ends up being around 10%. Is that true? If so, do other chlorine manufacturers do this as well?
Also, the Lot Number stamped on this box of chlorine was B1206. Can anyone help me decipher this, as to when it was produced?