Product review (1 stars): Beware, something is wrong with filters from Amazon.
We purchased this filter from Amazon and followed all installation instructions for priming the filter, but the water tasted worse than before. Had a plastic taste that is not what we had with the previous filter. Not sure if we got a bad filter, but it was unacceptable and we contacted Amazon for a return. (filter manufacture stamp was 01/17)

Update 09/23/17:
We subsequently purchased a filter directly from the everydrop website as something was wrong with the Amazon filter. Upon installation we noticed a few differences. The amazon filter was difficult to install - the catch for the button would not engage without a lot of force. The everydrop filter installed much more easily. The second difference I noticed only upon opening the new filter. The everydrop filter felt lighter than I remembered the Amazon one feeling (before installation). The last difference was the everydrop filter had much more air to purge out than the Amazon one during the priming process.

All the packaging looked the same between the filters without major inspection. I do not know if the filters are used or counterfeit - all I know is something is wrong with them. Purchasing directly from the manufacturer seems a safer bet in my mind.