Charcoal filters help absorb odors that the ceramic compost keepers produce. Each filter is 5.5 inches in diameter around. Filters should be changed approximately every 6 months, depending on use, heat, and humidity.
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The filter should never get wet. Do not wash and reuse the filter. The charcoal in the filter absorbs the odors, and once it has fully absorbed to its maximum, discard the filter. Just pull out the old filter and throw it away to replace it. Inside the replacement packet is two filters. Just place one filter in the lid.
To replace the filter, pull the old filter out and toss it. Inside the replacement pack is two round filters. Only one filter is needed at a time, and it fits easily and snugly inside the lid.