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Calcium hypochlorite, or cal-hypo, tends to be the best shock for an above ground pool. It is widely available, affordable, and powerful. Cal-hypo shock is typically 65% to 75% chlorine and is very effective at ridding a pool of bacteria or other contaminants.

Because they are smaller than an average-sized swimming pool, building a plunge pool is less costly than a traditional pool. In-ground swimming pools cost about $67,000, while plunge pools cost around $20,000. You won’t have as much room to swim in, but the smaller size means you spend less on land excavation, materials, and hourly labor rates.

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.

An aboveground pool should be level within 1 inch—and it starts to become unsafe after a couple of inches. Any slope will lead to an uneven distribution of water, which will put pressure on your pool’s structure, wearing down the pool liner. In certain cases, it could cause your pool to collapse. Even if you’re within a safe window, you may still notice that the water level is uneven.