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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.

An above-ground pool with a deck can increase your home's value by as much as 4% to 7%, but it depends on your local climate, potential buyers, and the size and condition of your pool. Some buyers see a pool as a liability instead of a luxury, especially if it's at the end of its life span. In general, it's best to add a pool and deck to your property if it will bring you enjoyment—not because it raises the value of your home.

Generally speaking, most municipalities require you to get a permit when you build a pool. Whether or not you need a permit to install a plunge pool will depend on your local laws. It’s always better to check with your HOA and town clerk before digging for a new pool. Otherwise, violations could result in hefty fines. 

Yes, some pool designs do not have coping. However, most designers will extend the decking beyond the water's edge to keep water inside the pool and lower potential pool repair costs in the future. A pool without coping may look more seamless but can raise the risk of slipping and make it trickier to get in and out of the pool.