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Re: NFC: Re: Filterless Aquariums.

Sajjad, the correct number is 231. :)  Inches/231 = Gallons.

Second, gravel/sand does NOT displace the volume of it.  There's space
between teh grains, which is filled with water.  Figuring out the volume
isn't easy, and differs on the type -- bigger grains, less volume per
lb. An easy way to figure it out:  Fill a five gallon bucket with the
desired media (smaller is okay, too) and fill it to the brim with
water.  Pour the water carefully out into a container, and you'll get
the ammount of the volume that is NOT gravel.  So, if you get one
gallon, five gallons of media actually is four gallons of media.


Sajjad Lateef wrote:
> On Fri, 9 Feb 2001, Gary Rollwage wrote:
> > How much  (on the average) does gravel, plants, etc etc. displace
> > the amount of water in a tank?
> Hi folks,
> Haven't read all NFC mail in a week, so, apologies if this has been
> answered already.
> I presume that plants would displace only a small amount of water. Even if
> you have a lot of plants, you aren't loosing too much of water volume.
> I also presume that stones, sand and gravel would displace the about same
> amount of water as their volume. Multiply the length and depth of the tank
> with the height of the gravel to get the volume displaced (in cubic inches
> of you are using inches as the measure).
> There should be a standard conversion from cubic inches to gallons which I
> don't know. Here is an approximate attempt: A cubic inch is equivalent to
> 16.4 cubic centimeters (cc) and there are 1000 cc in a liter. Assuming
> 3.75 liters per US Gallon, we have about 3750 cc to a US Gallon or about
> 229 cubic inches to a US Gallon.
> Assuming that you have 3" of substrate in a 55 Gallon (3x1 ft base), you
> would then have 3 x 36 x 12 or 1296 cubic inches or about 5.6 Gallons of
> substrate. Approximating further, each inch of substrate in a 55 Gallon
> tank would displace about 1.5 to 2 gallons of water.
> Again, these numbers are all approximations. If anyone has better numbers,
> please do correct me.
> btw, does anyone have Ray Wolff's phone number (Wisconsin Rapids, WI) ?
> Tony/Ray Suydam: I got a filter from Marineland in the mail for the AATP.
> Sajjad

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