|Volume of 1 Kg/lt of Media|
|Standard – kg||70 Cu In|
|Plus – kg||71 Cu In|
|Mini – kg||84 Cu In|
|Ultra – kg||74 Cu In|
|Ultimate – kg||83 Cu In|
|MAXI – kg||76 Cu In|
|BioGravel – kg||49 Cu In|
|BioMotion – lt (.44 kg)||61 Cu In|
To calculate volume a 7”x7 1/4”x6 1/4 (317.2 cu in) container was used. This was filled with media. Because the media is “lumpy” it is not possible to completely fill the container, but it was filled as closely as possible to the top with media.
This introduces some error into the calculations which is more pronounced for the larger media such as Ultra and MAXI, but you will experience the same affect when filling your filter.
The container was weighed and the weight was divided by 317.2 to determine the volume occupied by 1 kg (2.21 lb).
Amount of Media Required for a Particular Tank Size
This question is asked quite a bit. It is common for filter manufacturers to indicate that a particular filter is suitable for a tank or pond of a certain size.
In many respects this is nonsensical. The amount of filtration required has almost nothing to do with the size of the tank or pond. If you had a 1,000 gallons of water with only a few fish, you probably wouldn’t need any filtration at all since the surface area of the tank would support enough bacteria to handle the ammonia produced.
The amount of filtration required depends on the amount of the load, which depends on the number, size and type of species in the tank or pond. The only hard data I have involves my testing of the first Endless River prototype using Biohome BioMotion on a 600 gallon quarantine tank.
If you’re interested, you can see the results of this testing at: https://greatwaveeng.com/home/test-results-of-er-1-prototype/
This filter was able to support an estimated fish load of 30 gr/gallon, a much heavier load than I would recommend, with 10 liters of media. A liter of Ultimate, Mini, Plus and Standard media are all fairly close to 1 kilogram.
Doing the math we find that .02 kg/gallon of media is required. As mentioned above this is only a wild guess for any particular situation, but should give safe results to support a pretty heavy fish load using any of the media mentioned.
In reality, you will probably want to stock your filter with as much Biohome media as your existing or selected filter will hold. To help you with this is the purpose of the remainder of this document.
For nitrate reduction 1-2 kg of media is required for 100 liters of water (26 gal) in most cases. See the chart below for more specific guidance. A low flow rate (yet to be quantified) is required.
|Nitrate Reduction Rules of Thumb|
|Environment||Amount of Biohome Required|
|Avg Community Tropical Tank||1 kg/26 gal (100 lt)|
|Avg Cold Water Tank||1-1.5 kg/26 gal (100 lt)|
|Predator Tank||1.5-2 kg/26 gal (100 lt)|
|Large Cichlid Tank||1.5-2 kg/26 gal (100 lt)|
|Malawi/Tanganyikan Tank||1.5-2 kg/26 gal (100 lt)|
|Avg Mixed Fish Pond||1 kg/52 gal (200 lt)|
|Avg Koi Pond||1 kg/39 gal (150 lt)|