Store all swimming pool chemicals in a cool, dry place located out of the reach of children. A garage is an excellent spot for this purpose. Be sure pool products are clearly labeled with tops tightly closed.
Wear gloves each time you handle the chemicals and never allow children, or anyone else, to swim directly after you have added chemicals to the swimming pool. The pH levels should be equalized and normal before allowing swimmers back into the pool. You will now this by reading the gauges or meters that come with most chemicals.
If you do not have one or know how to read one, ask your swimming pool supply retailer to show you how to properly read the gauges to know when it is safe to swim.