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find an old cotton towel - cut a 6 to 7 inch square out of it - punch a hole into the middle of the square - then put it under your media below the corncob or walnut. What it will do is trap the fine particulates - it'll come out gray or black. I wouldn't wash the squares with your laundry or even by themselves as you'll introduce lead contamination into your washing machine. Either rinse them out in the sink and let them air dry, or replace them from time to time. Also - sift your walnut through a screen between uses until you trash it. Corncob isn't worth sifting.
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