Quote Originally Posted by waterbear
any pool with a lot of organics in it will have a high chlorine demand and your chlorine will not hold until the organics are burned off!

Exactly, and Leslies was right, I just added the 2lbs of that shock and so far, two days later, there is a normal chlorine reading!!! 4 hours after the shock, i tested and it was dark dark purple..too much, of course but the next day and today the level is where it is supposed to be, so I will just do the standard shocking once a week. The guys in the store were right..!