Question about 3M Filtrete Ultra Allergen Air Filter (Purple Series) 12x36x1 Filtrete Purple Air Purifier

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3M Filtrete 1700 ultra air filters turning very dark

I have been using 3M Filtrete 1700 ultra air filters for 3 years. My house is 3 years old. Two months ago, I changed the filters (I have two units requiring 2-20x25, 2-20x20 and 1- 12x12 filters). I was surprised to see all of them were very dark grey. They had been changed exactly 3 months before. I put new 3m 1700 filters in. I checked them 30 days later and they were dark grey again, not quite as dark as the previous filters. It has now been two months since the change and they are now about as dark as the previous filters. I don't have pets, don't have dark carpets, actuallly have mostly wood floors or light carpet, have't turned on the gas fireplaces this year, don't burn candles and have no strange odors to suggest mold. What is causing the filters to get so dark? I have looked on other sites and see I am not the only one experiencing the problem. I wonder if 3M has changed the filter composition or do I have another problem. My filters are changed regularly, i checked my vacuum hepa filters and they are not dark, my air exchanger units are not dirty, what can it be and should I be worried?

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Posted on Jan 02, 2017

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cgpedley
  • 1 Answer

SOURCE: Can't reset the filter status lights.

Is it possible you put the filter in backwards?

Posted on Aug 11, 2009

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SOURCE: my filters turn black after about a week

I am also experiencing this problem, as well as 2 other people that I found on google, so I am inclined to think tha 3M has changed something in their manufacturing process, I think it very odd that this problem is manifesting itself at this time in different locations.
I have been using this product for sometime, and the problem of filters turning very dark did not exist when I started using this product

Posted on Feb 03, 2010

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My filters turn black after about a week


I am also experiencing this problem, as well as 2 other people that I found on google, so I am inclined to think tha 3M has changed something in their manufacturing process, I think it very odd that this problem is manifesting itself at this time in different locations.
I have been using this product for sometime, and the problem of filters turning very dark did not exist when I started using this product

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Is it possible you put the filter in backwards?

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