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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.

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.

Liquid chlorine is better for shock treatments or instances where you need to raise your chlorine levels quickly. Tablets are better for regular maintenance. Tablets take more time to dissolve but require less effort. You don’t need to measure out volume, and you can set them in a floater and let that do the work.

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.