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**To**:**Aquatic-Plants at actwin_com****Subject**:**Re: filter flow rates****From**:**"Roger S. Miller" <rgrmill at rt66_com>**- Date: Tue, 28 Dec 1999 12:12:37 -0500 (est)
- In-Reply-To: <199912280848.DAA27614 at actwin_com>

On Tue, 28 Dec 1999, Tom Bates wrote: > There are a number of factors to take into consideration[...snip] > Here is the formula to compute average turnover rate. Average turnover rate > is the amount of time, in hours, it will take for 99% of the water in a > given aquarium to pass through a given filter. This formula takes into > consideration the decreasing flow rates created by the filter media as it > becomes clogged. > > T(ave) = 12.75 x G divided by F > > T(ave) is turnover average > 12.75 is a purity coefficient (a constant factor [given]) > G is the net gallons of the aquarium > F is the manufacturers rated flow of the filter Sorry, but I have to disagree. The filter flow rate divided by tank volume is a good qualitative measure for filter sizing. The average turnover rate is (under condition of complete mixing in the tank) exactly the filter flow rate divided by the tank volume. This follows from rather intuitive logic and it can be shown with much more rigorous (and pointless) math. Some parts of the tank volume will cycle through the filter more often than given by this ratio, and some parts will cycle through less often; the average is given by the flow rate/volume ratio. I don't see how throwing a coefficient into the formula adds to the usefulness of the ratio. Roger Miller

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