 Re: activated carbon
hi found this article on activated carbon, Activated carbon, (a.k.a.Lignite) produced from a soft, brownish-black coal in which the alteration of vegetable matter has proceeded further than in peat but not as far as in bituminous coal. Also called brown coal, is the best choice for ponds, organic molecule (pesticides) and color removal, due to it's large pore size. Lignite has the added advantage of being one of the softer Activated Carbons, which enables you to grind off most of the bio-film accumulated, by kneading the bag during routine filter cleaning. You can also reduce the accumulated bio-film by drying or boiling the A/C. If used in a bead filter, the scrubbing action will expose new surface area during backwash. The large pore size is important, because the organics in a pond environment will clog and render ineffective, the smaller-pored, coconut shell and other carbons. 6 Grams of this type of Lignite Activated Carbon has the surface area of a football field. Our 3 decades of experience and testing have shown other Activated Carbons, i.e. pelletized, processed, to be almost useless for pond water, but excellent for Chlorine and Heavy metal removal in clear water applications such as swimming pools or drinking water ???no good,hope this helps ??? | 
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