You can go online at Costco.com and apply for a Costco Membership there by adding it to your shopping cart if you are shopping for the first time. Your membership card will be mailed to you within 7-10 days but you can actually shop at the online store immediately.
The three most common chlorine-containing substances used in water treatment are chlorine gas, sodium hypochlorite, and calcium hypochlorite.
The type of chloramine discussed on this page that is used to treat drinking water (monochloramine) is not the same type that can form and harm the indoor air quality around swimming pools (dichloramine or trichloramine) . Chlorine was first used as a drinking water disinfectant in Europe in the late 1800s. It was first used in the U.S. in 1908 in Jersey City, New Jersey . Chloramine has been used as a drinking water disinfectant in the U.S. in places like Cleveland, Ohio, Springfield, Illinois, and Lansing, Michigan since 1929 . Today, chlorine and chloramine are the major disinfectants used to disinfect public water systems.