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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. 

If your pool’s pH level is too high, chlorine won’t be as effective. Since chlorine is responsible for sanitation and keeping bacteria out of your pool, a high pH level could create a higher risk for bacterial diseases. It can also make you more susceptible to rashes and infections (like swimmer’s ear). Need to lower your pool’s pH? You can do it yourself for between $5 and $40.

Yes, you can use chlorine tablets in a salt water pool. It is not the standard recommended practice, but if your pool needs more chlorine, adding tablets can help temporarily fix the problem. Only add as many tablets as needed to keep your chlorine level around three parts per million. After adding the tablets, test your water to determine the chlorine content.

If you put too much baking soda in your pool, your alkalinity will rise. That means you’ll need to take steps to lower your alkalinity. You can either add more water (which will require more chemicals because they’ll be diluted), wait for the alkalinity to lower naturally, or use a chemical like muriatic acid to lower it.