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The only pools that don’t need grounding are those without electrical components, such as small inflatable pools. Any outlet around a pool should be a GFCI to cut the current if the outlet gets too wet. At the very least, the pool’s electrical should be plugged into a GFCI outlet, if not a dedicated GFCI breaker. Check local guidelines and requirements to ensure you’re following all safety regulations. 

Concrete pools have the longest life span. As long as you properly maintain your concrete pool, you can expect it to last 50 to 100 years. That said, you will need to resurface your concrete pool as it ages. Fiberglass is durable, but fiberglass pools generally only last around 25 to 30 years. That said, some high-end fiberglass pools can last more than 50 years if they’re well-maintained.

If a pool turns green after adding salt, there’s a good chance the salt is the problem. Certain brands of salt have high levels of iron that cause pool water to take on a green hue. Test your pool water to determine if this is the issue. The green color will usually filter out. Brush the sides of the pool to knock the iron off.

This is just one reason a pool can turn green that is specific to adding salt. Many other reasons a pool can turn green include algae growth, low chlorine levels, a faulty filter, etc.

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.