Product review (1 stars): I received spent filters.  Be sure to check imediatly when you receive your order to make sure they are new filters
Be careful when you receive the shipment to check immediately to make sure the filters are new. I ordered well in advance of needing to change the filter, and when I opened the boxes (I bot two), both were already used and clogged up.  Someone must have bot new ones and returned their old ones.  By the time I found out it was too late to return, so I ended up a pair of spent filters.