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No, shock and chlorine are not the same thing, though they are related and both are used for pool maintenance. Regular chlorine, often in the form of tablets, is a sanitizer used for routine, day-to-day maintenance to keep a steady chlorine level. Pool shock, however, is a highly concentrated dose of chlorine used periodically for a more intense cleaning. It rapidly raises chlorine levels to fix issues like cloudy water or algae growth and also eliminates chloramines, which are byproducts of regular chlorination. Because their purposes and concentrations differ, they are not interchangeable, and proper pool care typically requires using both.

DIY is not recommended due to its complexity. Professional installation ensures proper fitting and longevity.

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. 

You don’t need to drain the whole pool to patch a pool liner, but be prepared to dive in with your swimsuit and goggles to patch a leak below the water level. By draining the pool, you can actually expose the liner to more harsh conditions, like wind and sunlight, that cause the tears to worsen. It’s best to use the ink test and waterproof patches or tape to identify the leak and patch it up.