When to shock

I would raise the FC level a little extra before the party. After the party, if the FC level went to zero I would shock, but hopefully the FC level won't go to zero and simply adding a little extra chlorine will take care of things.
 
It certainally will not hurt anything to shock after a pool party.

I recommend that you raise your FC to high target for your CYA level prior to the party.

You can test during the party (if it lasts for quite a while) and adjust if needed.

And test pH & FC after the party and make necessary adjustments.

There are so many variables for the definition of "heavy swimload" - I'll leave that to someone else. :wink:
 
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