Microplastics come in various sizes, as do many beans and grains. The idea is to make sieve hole sizes slightly smaller than typical beans and grains, to filter out microplastics. That is all. Act now.-- 4and20, May 26 2022 ... then you discard the beans and grain, and you are left with a useful dish of microplastics.-- pocmloc, May 26 2022 ...or just leave them in, for "that which does not kill me makes me stronger."-- whatrock, May 26 2022 random, halfbakery