Infinite, if the container is tightly closed.
Backwash first then shock. If you shock and then backwash you will be throwing away the shock you just put.
3800 gals of pool water shock it with 1 gal bleach
There is chlorine shock and non chlorine shock. Fo chlorine shock, which is the normal shock, it is the same a s Chlorine but unstabilized, so it will not last in the pool very long.
You do not need to remove it.
To shock a pool is to effectively increase the chlorine dosage to the max in order to exterminate a bacterial or algae problem.
No, pool shock is normally a really strong chlorine and stabilizer is like sunscreen for the chlorine
Our pool supplier said at least 5 years, usually more.
shock it
Yes, DNA does have a shelf life. It has a shelf life of about four years if it is properly preserved.
Salt pools still require weekly shock maintenance, but not near the amount that a chlorine pool would need. There are Salt Pool Shock Treatments out there for your particular pool setup.
I try and shock my pool every other day, or, if it rains, shock it at night after it rains (never during rain).