closing IG pool at shock level

Diver

0
May 5, 2011
480
South of Boston
in the sticky it's recommended to shock the pool 2-3 days before closing, let the levels drop half way back to normal and close it.

due to a timeline difficulties, i might not be able to follow that schedule and i was wondering if i can shock it immediately before closing? is there any danger of liner/cover damage due to high CL levels?
 
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