Get matched with top pool table assembly pros in Monticello, AR

At noon, when the sun is at its highest point, sunlight can naturally increase the temperature of a pool by 0.7 degrees each hour, but this can depend on other external factors. For example, evaporation caused by the sun will cause a pool to lose up to 5 degrees for every 1/2 inch of water evaporated. Using a water heater will produce more reliable results.

It's not ideal, and if your pool’s pH is seriously low (below 7), swimming can be dangerous until you raise it, potentially causing severe irritation and damage to the skin and eyes.

Keep in mind that low pH can also be responsible for damaging the pool itself. Acidic water can contribute to the cracking of your pool's liner, which may cost up to $2,500 to replace, making this an expensive fix.

The disadvantages of container pools come down to flexibility and customization. Shipping containers come in standard sizes, so the sizes and shapes are limited. They also have a very distinctive look, which may not suit the aesthetic of your backyard. 

Beyond that, while container pools are more affordable than in-ground pools, certain models can be more expensive. This includes the cost to heat your pool, since the metal walls have more heat transfer than other types of pools (which some brands circumvent with insulation).

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.