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Nitrates vs. DOCs



The recent thread got me to thinking-  If DOcs are indeed a factor in growth 
rates, then carbon filtering should make a difference.  Has anyone on the 
list actually run a control-group comparison of growth rates with and without 
carbon filtering (in addition to regular water changes of course)?  Does 
anyone know of a way to monitor carbon to know when it is nearing the end of 
its useful life and is ready for replacement?

Bob Dixon


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