Product review (3 stars): Be careful about product and fulfillment!
This is LG's discontinued 5231JA2006A, NOT the current 5231JA2006B. I replaced my older filter when this arrived from Amazon and it works, but the current version is an improvement over this one.  The problem with this filter is the price they are demanding for a discontinued product.  I paid way too much for this filter as it is inferior to the current item that is available on the market.  Unfortunately, the vendor doesn't make it clear exactly which filter one is purchasing, since the current product's item number appears in parentheses here on Amazon (and, as I recall, on the vendor's website).  I recommend finding the current filter and paying the few extra dollars as it is superior to this one.

UPDATE:

Unfortunately, Amazon often compiles reviews for identically-titled, though slightly different products, so it is sometimes difficult to identify the exact product/vendor being reviewed. The product I reviewed above was marketed -- and purchased -- as the LG 5231JA2006B, but I received the discontinued filter.  My review then appeared under both product listings on Amazon for some reason.  The vendor was a third party vendor (not fulfilled by Amazon), and I don't recall exactly which vendor it was.  The lesson here is to be careful not only about the product one purchases, but to identify how and by whom the purchase is fulfilled.  I have since purchased the current (and correct) filter a number of times on Amazon and am very happy with it.