04-24-2010, 02:02 AM
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I just went to their website and this is what it says: Details: Remove carbon from filter during use. If necessary, second dose may be added in four days. Change 25% of the water before adding second dose.
That tells me that the first dose would be 4 days, then a 25% water change, then a second dose if needed, for another 4 days. After the 4 day treatment and water change that would be the time to put carbon back into the filter unless you're going to start another round of treatment.