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Unless you have an alternative to chlorine in your pool to prevent bacteria and viruses from taking up residence in your water, it’s not safe to swim in a pool without enough chlorine. According to the Centers for Disease Control and Prevention (CDC), swimming in a pool with insufficient chlorine could lead to skin and eye irritation, ear issues, respiratory distress, such as coughing and congestion, and various other health issues. Always make sure your chlorine levels are healthy and stable before swimming for proper pool safety.

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.

If you’re wondering how to find a leak in an aboveground pool, the process is the same as it is for an in-ground pool. Note that the vinyl liner in aboveground pools is fairly thin, so sharp objects easily puncture it. Additionally, the liner can wear down after constant exposure to pool chemicals, especially when chlorine levels are higher than they should be. For these reasons, small holes in the vinyl liner often cause leaks, but you can easily detect them with the dye test.

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.