Product review (1 stars): Refregirator Water Filter, LG5231JA2006A
First time bought this product (Refregirator Water Filter) online at Amazon.( approx $31) and it lasted 4 months.
( $7.75/per month)
Before that, for more that 6 years , I use to buy it at Sears  (approx $45 and it lasted  6 months ( $7.5/per month)
My refrigerator has a sensor which indicates when to change filter.
So, conclusion that cheaper is not better . The filter is not the same quality and now , I will go back to buying from sears.