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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.

It's not ideal, and if your pool’s pH is seriously low (below 7), swimming can be dangerous until you raise it, potentially causing severe irritation and damage to the skin and eyes.

Keep in mind that low pH can also be responsible for damaging the pool itself. Acidic water can contribute to the cracking of your pool's liner, which may cost up to $2,500 to replace, making this an expensive fix.

Generally speaking, you should expect to wait 24 to 48 hours after filling a pool before you use it. However, the actual timeline depends on a few factors. Most importantly, you need to shock the water with chlorine or an alternative to swimming pool chlorine and let the concentration come down to a safe level before using the pool. Additionally, most water sources will be cold, and it can take days before the sun or your pool heater warms your water to a comfortable temperature. Alternatively, getting water professionally delivered could have you swimming in just a few hours.

If your pool’s pH level is too high, chlorine won’t be as effective. Since chlorine is responsible for sanitation and keeping bacteria out of your pool, a high pH level could create a higher risk for bacterial diseases. It can also make you more susceptible to rashes and infections (like swimmer’s ear). Need to lower your pool’s pH? You can do it yourself for between $5 and $40.