A bit concerned about quality & longevity

Received these filters yesterday. While they look the same size and shape as my original Kenmore Elite 960 filter, I'm a bit concerned whether one of these filters will last as long. That's because when I compared its weight to a Kenmore filter which I haven't used yet, it is much, much more lightweight. So that may mean that it doesn't contain enough filtering ingredients to do the job for as long a period of time (usually my Kenmore Elite filter lasts 6 months). If the Aquacrest manufacturer sees this review, I hope that they will respond and provide an explanation for the weight differentiation because I do wonder if I've wasted my money on an inferior product.

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