Any time you like calcium is harmless
Shock your pool at sundown and you can swim in it the next morning.
maybe if you like to hurt yourself
Read the label, but usually it is safe. Pool Masters
you should have your pool tested just to be on the safe side.
My pool store said wait 5 hours, but it probably depends on the amount and concentration (liquid or powder).
no
Yes
It is only safe to swim in a pool when a dead rat is found if it has been drained and sanitized. You risk dying if you enter before the pool has been 100 percent sanitized.
no you would have to do something about it
It is not recommended to swim in water that is being treated with most algaecides.
Pool chemicals in general are not safe, especially for ingestion so be sure to keep these away from small children and pets. Many of the manufacturers now make shock that will not irritate the skin so you can swim almost immediately after adding.
no it is not because you can get some in your foot.