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Deactivated Charcoal for Compost #879782

Asked August 01, 2024, 3:52 PM EDT

I've been composting for about three years now.  We have stainless steel bins with holes in the top  on the counter where we store food scraps.  In the top of the bins, we put carbon filters that we change out  every three months.   It seems like the filters always start to grow a white mold and get mildly stinky no matter what brand or kind.    I don't like living with this!!   I'm looking for some guidance on odors!  I've heard putting de-activated charcoal in the in the bins would keep the odor from  wafting out.  Where do I get the charcoal?  What is a good brand?  I see activated charcoal also.  Do you recommend activated or de-activated?  

We are kind of lazy and busy so we don't take the kitchen food scraps out to the pile that often.  If you have any other helpful tips -  for example would it help to switch to a different kind of counter storage - what would be helpful?

We use our finished  compost in a flower garden. Our main goal with composting is supporting climate health.

Jefferson County Colorado

Expert Response

Dear Janey,
Thank you for contacting us with your question regarding composting.  You are doing great things for climate health!
I've had the same problem with composting.  Your type of kitchen compost bin is recommended because it has ventilation holes that are supposed to cut down on odors.  Activated charcoal is recommended to cut down on odors.  In this heat, I would recommend washing the filters more frequently as well as changing the activated charcoal more frequently than recommended.  Cornell University suggests lining the bin with newspaper and covering the bin only with newspaper or a paper towel.  They state that putting a lid on the bin promotes fermentation which will lead to odors. 
Another option that I have tried, is to put the compostables in a LABELED paper bag, and put it in the freezer.  When it is full, you can carry the whole bag to the outdoor compost heap and just toss it in.  
I hope these suggestions help!
Best regards,
Cindy G.
Colorado Master Gardener

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