Through the use of coral in gold several diseases can be warded off, particularly tropical fevers, chicken pox, jaundice, fistula, impotency and ailments pertaining to blood, particularly impure blood.
The goal of shocking your pool is to raise the free chlorine level of your pool water to roughly 10 times the combined chlorine level of your pool water.
Another alternative is that you could bring your pool water to the local swimming pool store and have them test it for you. They also can tell and sell you the correct amount of shock that you will need to add to your pool. You will have to tell them your pool size after they test your swimming pool water.