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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.

A pool heater is worth the expense, given that it can extend your swimming season by several months, depending on where you live. For many, adding a pool heater allows the pool to remain in service from May through mid-October. Even temperatures in the 40s and 50s are tolerable when the water in the pool is heated.

While some water loss from splashing and evaporation is normal, a rapid or excessive drop in the water level may indicate a leak. Other signs of a pool leak include unexplained soft or wet spots in the yard, cracks in the pool structure or falling tiles, higher-than-normal water bills, persistent algae growth or water discoloration, and standing water around the pump, pipes, or other pool equipment.

You can place many materials under a pool to level it, including sand, concrete, solid foam, pavers, or finely crushed gravel. You can also use a tamper or roller to level ground without using a shovel to dig. No matter the material, make sure to level the ground with sand first for a smooth, even surface for the pool to sit on.