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A black tarp will indeed heat your pool. Black absorbs more heat than other colors. This heat will transfer down to the water in your pool and help increase the temperature. It will not be extremely effective at raising the overall temperature, but it can help maintain the current temperature.

An in-ground concrete pool will carry the highest price tag of all available types of pools, with architectural or freeform concrete pools found at the top end of the price range. Although the upfront costs for a concrete pool are high, these pools tend to be more durable than pools made from other materials and will last the longest. 

It's not a good idea to drain an aboveground pool into your yard since the pool water's chemicals can harm your plants and the surrounding ecosystem. Instead, it's best to drain the pool into an appropriate sewer so it can be processed at a water treatment plant. You might also be able to drain it into your storm drain, depending on your region. Check with your city to learn about any relevant regulations.

A few factors influence the time it takes for a pool to heat up, including the size of your pool, the temperature outside, and how much direct sunlight is hitting the water in the pool. With these factors in mind, it takes 12 to 72 hours to raise the temperature in a pool by 20 degrees Fahrenheit.

While you can run a pool heater all day, it is advised only to run it during the day, as it is more energy efficient. At night, it is better to purchase a solar pool cover to retain the heat within the pool.