The average pool loses one-eighth of an inch of water every day. However, how much your pool will lose depends on various factors, such as water temperature, climate, and weather. Warm water will evaporate more quickly than cold water, and pools in low-humidity climates will experience faster evaporation. However, this doesn’t mean you’ll need to constantly refill your pool.

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.

Building an inground pool is a job best left to the pros. Excavating the area and building the pool requires heavy equipment and specialized training, and pools have complex plumbing and electrical systems. Unless you’re experienced in these areas, you’re better off hiring a pool contractor to make sure the job gets done safely and correctly. 

A 24-foot diameter pool is the most popular size for a round above ground model, while 15 by 30 feet is a common choice for oval-shaped pools. However, you'll find round sizes everywhere between 8 and 33 feet. Oval pools range up to 21 by 41 feet but can be customized to stretch much longer. Choosing the right size will come down to where you can level your yard and how many swimmers plan to use the pool at a given time.