I've used 3 different types of charcoal recently as I'm getting back into my aquarium hobby and both other brands had lots of fine sand with charcoal seeping through the bags and filter. Container for filters that I use. This charcoal works much better for me because the chunks are slightly larger and not much finer sand can come loose. In the future I will only buy this coal. Updated 8/3/2013. I'll like it for a while but I've noticed that sometimes I get orange stains from this product like it has iron or something rusty in it. It's not that important to me, but I thought I'd let people know. I plan to still use it and will buy again, but if someone cares I figured they should know.
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