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Biological Filter Media

Discussion in 'General Plant Topics' started by shane, May 17, 2008.

  1. shane

    shane Lifetime Charter Member
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    I currently use Eheim EhfiSubtrate for my biological filter media (it came with the filters). I have been running it for about 1.5 years now. How long does the biological filter media last? How often does it need to be changed out? What is the best biological filter media to use?
     
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