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.
Pool shock is either chlorine or non-chlorine chemicals that you add to the pool to destroy any contaminates in the water. The goal is to raise the free chlorine levels to a point where it will destroy any algae or bacteria growing in the pool.