Product review (1 stars): wimpy
I saw the wf813 filter on amazon and thought good price and cheaper than going to the store. Well, I ended up going to Walmart and compared their wf813 filter and it comes down to this... the one's at walmart were twice as thick and stand up even when soaked with water, HENCE putting plenty of moisture into the air. The other one's from amazon might look the same in their picture but believe me when I say "I had to use paper clips to hold them up and they still wanted to fall over due to being thiner and they barely put any moisture into the air after hours of running. pay the extra .50 or .75 cents and go to Walmart. P.S. Looking at the picture the dark part of the filter was not there only the white part of the filter was there. Hope this clears things up for you.