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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.

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).

Aboveground pools take between one day to a few days to install, depending on the pool size and type. Your project may take longer if you’re planning to complete other projects simultaneously, like building a deck around the pool. If your land is hilly or rocky, you’ll also need to budget time for the land preparation. Aboveground pools need to be installed on a level surface.

The best way to kill off an algae bloom in an aboveground pool is to shock it with a large dose of chlorine. Shock typically kills off algae in about one to three days, although it can take longer if the pool water is in poor condition. After the shock treatment, add algaecide to prevent algae from growing back, and test the water every few days with test strips to ensure the pool’s pH doesn’t get out of whack.