Chlorine and pH, your disinfection team, are the first defense against germs that can make swimmers sick. As a residential pool owner, it is your responsibility to regularly check the chlorine concentration and pH of the pool water to help protect yourself and your family and friends from swimming-related illnesses.
Why does chlorine need to be tested regularly? All sorts of things can reduce chlorine concentration in pool water. Free available chlorine breaks down pee, poop, sweat, and dirt from swimmers’ bodies instead of killing germs and uses up chlorine, which means there is less to kill germs. Sunlight also uses up free chlorine. That’s why the free chlorine concentration must be routinely tested. And remember, the time it takes for free chlorine to kill germs is also affected by the other member of the disinfection team, pH. How do I test chlorine and pH levels in my pool? For most accurate testing results, pool and hot tub/spa owners should use a DPD test kit to measure free chlorine and pH. Of note, if the free chlorine concentration of the water sampled from the pool or hot tub/spa is more than 10 ppm, the test might partially or totally bleach out, resulting in a false low or 0 ppm free chlorine result. Pool owners alternatively can use test strips, with the understanding they are less accurate than the DPD test kit. Regardless of what test is used, owners should always follow manufacturer’s directions. How often should I test?
Test free chlorine concentration and pH at least every other day and more often when the pool is used heavily.
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Advice, Tutorials & DIY'sAuthorPacific Pool Supply Archives
July 2023
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