I've been getting 12.5% chlorine at the pool store near by. Price has been somewhat high but for the convenience I could take that. Recently the chlorine price has rose to 28 dollars per 4. At 7 dollars a gallon, convenience and support of a local business has to go! In shopping on line I've found 10% at 16 dollars per 4 and free shipping. Has anyone ordered chlorine on-line and was it a good "fresh" product when received?? Any advise apprecieated!!