If there is a high oxygen level in the sump (such as after the skimmer) then the H2S will be at least partially oxidized where it can be removed by carbon. If there is H2S smell in the air carbon will remove it. GFO will also remove H2S.
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~ Mindy
SPS fanatic.
Last edited by Myka; 12-27-2012 at 03:41 AM.
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