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Featured DSB in weir?

Discussion in 'Filtration / ULNS' started by Mayo, Dec 20, 2013.

  1. mo_bhaiyat

    mo_bhaiyat Registered

    Jul 5, 2013
    Likes Received:
    I'm loving the concept but I'm wondering why you want both a DSB and MM. Only reason in asking is because I'm considering building a external weir which will be 25" x 4" and and debating DSB or MM. Never though of using both.
  2. Colin

    Colin Registered

    May 7, 2011
    Likes Received:
    I honestly don't know, just guessing that some bacteria get their oxygen from the nitrate in that area but that is just a guess
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