Product review (1 stars): Missing the MAIN requirements of a charcoal filter...
As soon as these filters arrived I examined them. The box they shipped in did have a very very small amount of charcoal dust in the bottom. However, not enough to account for the large empty spaces in the filter where there should be charcoal. Both of these filters had multiple holes/gaps in the charcoal where air would pass unfiltered. In order for these to be effective as filtration you should not be able to see through areas of the filter where there is no charcoal a quality filter when held up to light should have no visibility through the filter and you should see very very little to no light at all passing through the filter. The filters I recieved would leave a decent amount of odor and smoke behind due to the lack of charcoal. These filters need more charcoal as well as a finer particulate of charcoal to be effective.