Safety is always a concern in swimming pools.
There is no substitution for parental guidance around pools. 

• One individual must assume primary responsibility for supervising the pool and consistently enforcing pool rules.
• Pool rules should be clearly communicated and understood by all persons young or old who use your pool.
• Pay special attention to educating young children and non-swimmers about important safety precautions.
• If you're uncomfortable with someone's swimming abilities, make sure they stay in the shallow water area and watch them closely.
• Never swim alone or allow others to do so.

There are several new technologies for helping monitor your pool. There are alarms that sense rapid water movement (someone in the water) and then set off an alarm inside the home. There is a perimeter laser barrier that sets off an alarm if someone gets close to the pool. A pool camera is also available that turns on with motion and sets off an alarm in the home as well as projects a view of the backyard on your TV.
Safety Swimming pool covers

Water testing offers continuous protection against bacteria and un-safe water. Always read the product label and follow directions carefully. It contains important information on the proper application, handling and storage of the compound you're using. Used correctly, pool water maintenance products safeguard the health of your entire family. If they're mishandled, they can be hazardous. pool water testing

• Always store chemical products safely and out of the reach of small children. Keep your pool maintenance products in a cool, dry, well-ventilated area, away from other household or garden chemicals and petroleum products.
• Always clean up any spills as soon as they occur and dispose of the material in a safe manner. Small spills can be diluted by hosing off into the pool. Never use a vacuum cleaner to clean spills. It's hazardous to throw chemicals into the trash or put spilled material back into the original container. Keep all spills away from lawns and landscaping to avoid damage. Dispose of all chemicals according to label directions.
• Never allow children to handle, measure or dispense chemicals.
• Never mix chemicals of any kind together. An uncontrolled reaction such as fuming, fire or explosion could occur. Always add maintenance products to the pool water separately and in different areas.
• Never overdose your pool. Use the exact amount specified on the label. Knowing your pool's exact volume will help prevent over - or under -application.

Make your entertaining truly enjoyable:

• Keep electrical appliances a significant distance from the pool.
  Don't use extension cords. Use a ground fault circuit interrupter (GFCI) on any appliance or electrical device that is used poolside.
• Use of alcohol or drugs do not mix with pool activities.
• Games that may appear safe sometimes are not. Encourage and supervise the use of good pool games and toys. Prohibit horseplay, especially throwing or pushing someone into the pool.
• You have the bottom line responsibility in poolside entertaining. Use good judgment to help protect yourself, your family and guests. If in doubt, prohibit use of the pool by persons whose condition you doubt. Remember, you are in charge of your pool.