Drinking municipal water isnít the healthiest way to stay hydrated. The 5231JA2006A refrigerator water filter purifies your water by passing it through activated carbon which removes the impurities. We offer three different models of 5231JA2006A filters: The OEM LG replacement, the aftermarket Supco replacement, and the lowest priced aftermarket Swift Green replacement. The LG replacement has been strictly tested and certified to meet NSF International Standard 42, meaning it has been certified to reduce chlorine taste and odor from your water. However, even though neither aftermarket filters are NSF certified, we recommend choosing either the Swift Green or Supco filter due to their affordable pricing and outstanding filtration. The 5231JA2006A filter should be changed at least once every 6 months to ensure that your water tastes great and remains clean and healthy.