Product review (4 stars): I have been using these filters for a couple of ...
I have been using these filters for a couple of years. Definitely have to agree with some other poster comments that EVERY time you refill your water, you must turn the filter over. I usually don't even wait for the water to run out, but check and turn filters twice a day. By doing this, there is a substantial increase in how long the filter will last based on my experience. I did not do this for the first several filters I used last year, and the filters started to deteriorate within a couple of weeks.
  Also agree with other postings that if you need to wash them, some basic dish detergent is all you need. I do wish the filters would last longer, but one can definitely extend their life by continually turning the filter over in the water reservoir and making sure the edges stay moist.