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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.

Spools can come as small as 10 x 6 feet, so they don’t take up a lot of room in your yard. You’ll want to plan for pool decking, fencing, and other features that may take additional space, but for the most part, a spool’s small footprint makes it a great choice when you don’t have much yard space to spare.

A good rule of thumb is to add one or two 40-pound bags of salt for every inch of rain, but you’ll want to test your salt levels first to ensure you’re adding the right amount. Rainwater can dilute the salt levels in your pool, so after significant rainfall, test the levels and add the appropriate amount of salt to bring it back to the ideal level.

Fiberglass pools last the longest because they need the least amount of maintenance and do not have liners that can affect a pool's integrity. Concrete pools last the longest, next to fiberglass.