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Featured DSB in weir?

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

  1. mo_bhaiyat

    mo_bhaiyat Registered

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    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

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    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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