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.

Yes, you can put too much shock in a pool, and it is crucial to follow the directions on the product you are using. Adding excess shock can upset the chemical balance, make the water cloudy, have adverse effects on swimmers, damage pool equipment or surfaces, and even encourage certain types of algae to grow. If you have over-shocked your pool, perform a water test and adjust the chemicals as necessary. The pool's chemical balance will eventually return to normal as the excess chlorine dissipates over time.

Once you use a pH decreaser, you can expect the pH to adjust in two to four hours. If you use a strong chemical like muriatic acid, it could take as little as an hour. Either way, it’s best to wait for a full turnover cycle before retesting. You want to make sure the chemical is completely dissolved and evenly distributed or you won’t have a stable pH level.

You can purchase preassembled or customized endless pools as small as 6-by-6 feet, though larger options are more common. For safety purposes, you will also need to set aside space surrounding the pool to support the pool and pool deck. A pool size chart can help you visualize the best shape for your needs.