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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.

Setting up a pool on unlevel ground is not recommended as it can damage the pool or yard and put the safety of those using it at risk. If a pool isn't level, the water's weight won't distribute evenly, putting excessive pressure on certain parts. This can cause the pool liner to tear or the walls to collapse, leading to water damage, expensive repairs, or potential injury to swimmers. It is more cost-effective to level the ground correctly before installation rather than waiting to address serious structural issues later.

There are some disadvantages to a salt water pool. Besides costing slightly more than chlorine pools, salt water pools require a lot of salt. It's also harder to find a professional with salt water pool experience to do minor maintenance and repairs. Salt water can also damage some materials, so you’ll need to use specific heating, fixtures, lighting, liners, and masonry when building a salt water pool.

Just like a traditional in-ground pool, semi-inground pools can be between three and eight feet deep. Lap pools, for example, are often an average of 4 feet deep, while a traditional pool may have both a shallow and deep end. The depth of your semi-inground pool depends on the liner you purchase, as well as how much excavation you plan to do before the installation.