I don't have any algae issues in the pool and want to close/Winterize on Saturday. Can I just raise the chlorine up to shock level the day that I am closing the pool or does the shock level need to be maintained for several days prior to closing???
Also, if my CYA is at 40 - where should I be in terms of shock level? The Chlorine/CYA chart shows I should be at 16. Is that an adequate level for closing for the entire Winter as well as undertaking the SLAM process?