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chillidude
PostPosted: May 3rd, '12, 13:10 
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mantis wrote:
You look to be about 4-5 bags of hydroton short in that bed :think:

and water
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bunson
PostPosted: May 3rd, '12, 15:15 
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:laughing3:

Added water months ago! More added last weekend...

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File comment: FT Water Level
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File comment: System performance as at 03 May 2012
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Last edited by bunson on May 3rd, '12, 15:23, edited 1 time in total.

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faye
PostPosted: May 3rd, '12, 15:19 
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Perhaps it's time for a photo update Bunson :) :) :)
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bunson
PostPosted: May 3rd, '12, 15:38 
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A historical montage then....

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bunson
PostPosted: May 3rd, '12, 15:40 
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File comment: 21 Apr 2012 => Thinned out heaps!
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File comment: 03 May 2012 => Been away for over a week and untouched.
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bunson
PostPosted: May 3rd, '12, 16:08 
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Rainbows loitering near the GB drain
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mantis
PostPosted: May 3rd, '12, 20:02 
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Heaps of venturi action from that growbed drain. Nice work :thumbright:
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Charlie
PostPosted: May 3rd, '12, 20:06 
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wow....didnt realise that was possible
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mantis
PostPosted: May 3rd, '12, 20:10 
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I get some from my pumped return from sump to fish tank but I dont think that much. But if the drain from growbed is directly over the fish tank then you could put more holes in the return above the water me thinks :think:
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faye
PostPosted: May 3rd, '12, 20:12 
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I love the bed full of sprouted seedlings, what did you plant Bunson?
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kevyrev
PostPosted: May 3rd, '12, 20:18 
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Nice setup bunson! Great action on that gb return, nice :shark:
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bunson
PostPosted: May 3rd, '12, 21:45 
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The GB drain is simply a 25mm standpipe with a 25/50mm "head". When water spills over the top of the wider diameter, air is drawn in and is carried along with the water; the air is compressed slightly as the water depth increases, so its release is quite dramatic.

The 25/50 is because of the amount of water going into the GB. If your pumping rate is less than mine then you can get away with smaller diameters; you'll know when you've got it right because you should be able to hear the drain "sucking".

I'll post some pics and maybe another vid tomorrow.

I don't have an air pump with this system, so I dump the aerated water at the bottom of the FT. The air creates an uplift and the water is directed to cause a swirl, making sure the water is thoroughly mixed and exposed to the air boundary layer.



Scott
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bunson
PostPosted: May 3rd, '12, 21:57 
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faye wrote:
I love the bed full of sprouted seedlings, what did you plant Bunson?

I found some seeds in the shed, and simply scattered a small handful in each of six sections in the GB, just to plant something green whilst the system was cycling.

Looking at the photos aspect:
Front left - silverbeet
Front right - kale
Mid left - sweet basil
Mid right - initially "fallow" but ended up chucking in some asian greens
Back left and right - two varieties of lettuce.

Now that things have stabilised, I have started thinning the initial crop and planting out what we want for winter. Not everything took too kindly to thinning (but the worms, chooks, friends and neighbours loved it!) After being so densely packed, the silverbeet and kale are quite spindly. Cest la vie.

I've still got some space left and nitrates at 10-20, so will have to find time to get to the nursery/B for some more seeds/seedlings.


Scott
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faye
PostPosted: May 4th, '12, 08:00 
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We have fresh seedlings, just arrived :)
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chillidude
PostPosted: May 4th, '12, 09:22 
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Charlie wrote:
wow....didnt realise that was possible

Yep, just drill 3 or 4 holes in the GB outlet pipe, above the water line - works a treat.
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