No, you should be fine. Just make sure you put it in when you get home - no stopping to eat, no stopping to say hi to the family Just kidding. You should be fine - as long as there is chlorine in it now you are right on track. Just put it in when you get home, taking it back to shock whenever you can is the ticket - it won't get messed up waiting a little while. You just don't want the chlorine going down to 0. Have a good night