The activated carbon for fish tank filters works well. The smaller chips provide more surface area than large charcoal pieces, so it should be more effective...
If ye love wealth better than liberty, the tranquillity of servitude better than the animating contest of freedom, - go from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains sit lightly upon you, and may posterity forget that ye were our countrymen!
1 August 1776