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ecoquest · 17-02-2010, 05:52 PM

I'm no expert, but maybe the 4x is through trial and error (aka research) by the filter makers to determine the ideal turnover to allow the BB to colonise efficiently and/or for the waste in the tank to be filtered?

17-02-2010, 05:52 PM	#2
ecoquest Dragon Join Date: Mar 2006 Posts: 1,194	I'm no expert, but maybe the 4x is through trial and error (aka research) by the filter makers to determine the ideal turnover to allow the BB to colonise efficiently and/or for the waste in the tank to be filtered?