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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.

The time it takes for a pool heater to heat a pool can range from eight to 48 hours, with an average of about 12 hours for the initial heating. For a more specific example, an average-sized 15,000-gallon pool may take six to 10 hours to heat up by 10 degrees. The exact duration depends on several factors, including the pool's size, the type and size of the heater, the starting water temperature, and the outside air temperature. It may take some trial and error to determine the precise time your specific pool takes to reach a desired temperature.

Building an inground pool is a job best left to the pros. Excavating the area and building the pool requires heavy equipment and specialized training, and pools have complex plumbing and electrical systems. Unless you’re experienced in these areas, you’re better off hiring a pool contractor to make sure the job gets done safely and correctly. 

High alkalinity, which is above seven on the pH scale, is the result of improper chemical levels in the pool. Each chemical you use to keep your pool clean has a different pH, so a ratio that isn't optimized for your pool size may cause the number to go above 7.8, the high end for a good pH range in most swimming pools.