carbon usually lasts around 48 hrs that is the active stuff, now that is what i have read and heard.
But honesty i think if you have a huge bio load it's not going to be as good as a small bio load, i thought it's supposed to take out the smell and theyellowing in the water...
mike
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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