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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.

Yes, too much chlorine can make your pool cloudy, especially after you have recently shocked it. However, low chlorine levels are a more common cause of cloudy water. An imbalance in pH or an excess of any chemical can also lead to cloudiness. To determine the specific cause, you should test your pool water to check the levels of chlorine, pH, and other chemicals. Regular maintenance is essential for keeping your pool clean and clear.

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.

You should avoid filling your pool overnight—just as a precaution. You’ll want someone around to check on the progress. If your hose springs a leak or you overfill your pool, you could end up with some costly water damage. At worst, you could flood your home’s foundation. For this reason, ensure someone is home and awake, even if your pool takes a couple of days to fill.