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Yes, swimming in a pool with high calcium hardness is considered safe as long as you have sufficient chlorine and pH levels to keep bacteria growth under control. The main issue with high calcium hardness is that it damages your pool through rust and corrosion. However, if your water is hard enough to corrode your pool, you might want to consider finding methods to make it safe for drinking at home.

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.

You can build a plunge pool in an 8-by-8-foot space. Many plunge pools are about 8 to 12 feet wide, 2 to 24 feet long, and 4 to 8 feet deep. While these pools are smaller than your average swimming pool, you may want additional space for a deck or patio to surround the plunge pool.

The time it takes for a pool heater to heat a pool can range from eight to 48 hours, with an average of about 12 hours for the initial heating. For a more specific example, an average-sized 15,000-gallon pool may take six to 10 hours to heat up by 10 degrees. The exact duration depends on several factors, including the pool's size, the type and size of the heater, the starting water temperature, and the outside air temperature. It may take some trial and error to determine the precise time your specific pool takes to reach a desired temperature.