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PostPosted: Aug 14th, '09, 06:31 
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Seriously, this cant be healthy.
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knowmore09 wrote:
Hi,
Just finished designing this Vertical NFT with six 1 mtr (110mm) tubes holding 6 growpots each. Planning to run it on a 100ltr fish tank. It will be a continuous flow system.
Hope somebody finds this useful.
Cheers.
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I have one very major question about this system. Where is the filtration? Fish and plants are only two thirds of an aquaponics system. The other third of a functioning aquaponics system is the filtration, solids filtration and bio-filtration.

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PostPosted: Aug 14th, '09, 15:19 
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TC,
Thanks for moving this. This is planned as an NFT. And yes did realise the filtration was missing after I made the design. Planing to put a small gravel box on the left top where the water from the pump is going up (red pipes) just before it feeds the tubes at the T. Alternatively I might leave a layer of gravel inside the tubes so that the water flows over and thru that layer.
Have just finished the stand, cut out out the holes in the pipes and will set it up over the weekend. Will post pictures on Monday.
Cheers,
KM

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PostPosted: Aug 14th, '09, 20:45 
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Seriously, this cant be healthy.
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It might be worth you looking at some of the bio-filter plans bentaz is showing off.
http://backyardaquaponics.com/forum/viewtopic.php?f=1&t=5987

Remember that just a little gravel box is only going to support a small amount of fish.
3 kg of fish per 100 liters of flood and drain gravel. If you expect less gravel to support more fish your first issue is going to be the gravel getting completely clogged with solids and probably becoming anaerobic and stinking up the place.

I would personally advise against gravel in the pipes. Yes I know it can be done and it can work. However, if you do it, there will come a time that the roots growing in the gravel will block things up and it will be very hard and messy to clean out. When planting in holes in pipes, it is usually better to keep them clear of gravel and provide some other method of filtration before the water goes to the pipes.

In my system, the pipes are fed from a pump that uses water from a flood and drain gravel bed. There are still some fine solids build up in my pipes even after filtering through two sets of gravel beds but it is no where near as gross as what happened when I tried sending unfiltered water through some pipes.

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PostPosted: Aug 14th, '09, 21:21 
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Just wondering how the plants at the lower levels will get enough sunlight to grow.


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PostPosted: Aug 15th, '09, 17:33 
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crisgaston wrote:
Just wondering how the plants at the lower levels will get enough sunlight to grow.



I have seen many a system (some on this site) that utilise Growlights (hydro style)

With that you get the full benefit of the Hydro style lighting and the more *natural* aquaponic flow through..

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PostPosted: Aug 15th, '09, 18:11 
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Natural ..... grow-lights ..... for me the two are mutually exclusive

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PostPosted: Aug 27th, '09, 16:20 
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TCL: Thanks!! I did that and am now building a 1 mtr 110mm pipe filter from one of his designs using charcoal and nylon scrubs. Will post pics once the system is set up. Only gravel (10mm) in the pipes will be inside the pots to hold the plants.
AJ/Chappo: This will be sitting right out in the sun on a small open to sky terrace, In India we don't have a problem with lack of "natural light"!! lol. In fact it is more a problem of plenty! The temps go up to 45C in summer - that's in May and down to 12C in January in winter. It will facing be East.

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PostPosted: Nov 16th, '11, 01:22 
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[quote="TCLynx"][/quote]
hi tclynx,i have an amateur qestion that may already been answered but i want to ask it:
you said that you need 100lt of gravel GB for 3 kg of fish at max fish density.
this means that if you have a 2:1 ratio GB:FT you will have 50 lt FT.
3kg of fish-->50 lt FT is 6 kg-->100lt
double as the best provided for density.am i right or i think in a wrong way?

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PostPosted: Nov 16th, '11, 16:59 
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No, if you only have 50L then it's 1.5kg... Ummm, hang on, I'm confused What exactly is the question?

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PostPosted: Nov 16th, '11, 17:31 
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Some people suggest having a 2:1 ratio of growbeds to fish tank volume. This means that if you have a 500 litre fish tank you would have 1000 litres of growbeds/filtration.

Separate from that for every 100 litres of filtration you can stock a maximum of 3kg of fish (at harvest size).

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PostPosted: Nov 16th, '11, 18:07 
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@ earthbound:
the actual question was :
Density is calculated by your FT volume 3kg->100 lt of FT(2:1 GB:FT ratio for reaching max density at hasvest size)? this means 1,5 kg ->100lt of GB
or
Density is calculated by your GB volume 3kg->100lt of GB(2:1 GB:FT ratio)??
this means 3 kg ->100lt of GB --> 6kg->200lt of GB--> 6 kg->100lt of FT

again i want to apologize for my stupid question but i am now on the construction of my system and i just became confused
Before that i thought that with 2:1 ratio 200lt GB: 100lt FT you can stock at harvest size 3kg/100 lt FT
---> 1,5 kg/100lt GB

but now i am confused....

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PostPosted: Nov 16th, '11, 19:35 
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The only stupid question is one that is never asked.

The fish stocking density is calculated by the growbed volume.

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PostPosted: Nov 16th, '11, 19:37 
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thanks arbe ,i'm less confused now

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