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The formula you’ll use to measure your pool will differ based on the shape of your pool. For a rectangular pool, you’ll use the following formula to find the size in gallons: length x width x depth x 7.5. If the depth changes from one end of your pool to the other, take the average by finding the depth at the deepest and most shallow points and dividing that number by two. Circular and oval pools require different, more complicated formulas, which can be found in this article.

If a pool turns green after adding salt, there’s a good chance the salt is the problem. Certain brands of salt have high levels of iron that cause pool water to take on a green hue. Test your pool water to determine if this is the issue. The green color will usually filter out. Brush the sides of the pool to knock the iron off.

This is just one reason a pool can turn green that is specific to adding salt. Many other reasons a pool can turn green include algae growth, low chlorine levels, a faulty filter, etc.

Calcium lumps in a pool are calcium deposits that form when a pool's water parameters are not in the normal range. They can float around on the surface of the pool water, making it look and feel dirty. The most common causes of calcium lumps in pools are calcium hardness above 1,000 ppm, alkalinity over 120, and a pH over 7.8. Keeping your pool’s calcium levels, alkalinity, and pH levels within the normal, safe ranges is the best way to prevent calcium lumps and other problems, including damage to the pool surface.

Certain pools serve as a middle ground between traditional swimming pools and hot tubs. The two main options are plunge pools and swim spas. A plunge pool (or cocktail pool) is smaller, but you can add spa-like elements such as heating and jets. A swim spa is more similar to a hot tub, but it produces a current that allows you to swim in place (similar to how a treadmill lets you run in place).