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Chlorine performs several functions, depending on where and how you use it. In drinking water, chlorine in small amounts kills potentially harmful bacteria. It's also a common ingredient in detergents for its whitening properties. Most people associate the chemical with pool use, where it works to kill and control bacteria, germs, and viruses in the water. 

Generally, you do not need to drain your pool to convert it to a saltwater system. The main exception is if you have used an antibacterial agent containing polyhexamethylene biguanide to sanitize your pool, as these sanitation products do not mix well with saltwater systems. If this is the case, you will need to start fresh. You can either drain the pool or treat the existing water with a high dose of chlorine to remove the antibacterial agent. If you choose the chlorine treatment, wait several days to allow the chlorine to work before proceeding with the conversion. If you are unsure whether this applies to your pool, consult a pool technician.

You should add chlorine within 48 hours of filling your pool with water. In just 24 hours, bacteria and algae will begin to grow and contaminate your water. After that point, you’ll need to shock the water with high levels of chlorine, and you’ll likely need to do additional vacuuming to get the pool clean. It’s important to check your chlorine levels two to three times a week and add more chlorine as needed to maintain a healthy level.

It is possible to install an above-ground pool yourself in about six hours, provided your yard isn't too sloped or you don't have many trees. It's imperative to ensure your ground is level; otherwise, your pool could collapse. Contact a swimming pool installer for an in-ground pool installation or to ensure your above-ground pool is installed correctly.