Just about immediately
After adding calcium chloride to a swimming pool, you should wait at least 2 hours before swimming. It is recommended however that a full filtration cycle be allowed before entering the water.
Depending on quantity added -- about half hour.
You should wait a couple of hours before swimming in a pool after adding PH minus. Check your water before swimming to ensure that the PH has been lowered.
You may be able to use the pool right after adding the product, however, read the label on the clarifier to see what the manufacturer recommends and follow their advice.
It is advised to wait approximately two hours before swimming after adding pH to a pool. This gives the chemicals plenty of time to work.
as long as the swimming pool is :\
I'd wait for at least two hours before going in the pool.
For long term drinking water storage