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 Post subject: Re: Scott's system
PostPosted: Dec 6th, '07, 11:22 
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No..
But this is a rubber frog !


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PostPosted: Dec 6th, '07, 11:25 
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what have you used to clip the liner on with? I cut some lengths of 19mm poly and split them lengthwise to clip ours on.

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PostPosted: Dec 6th, '07, 11:39 
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Duct tape... hmmm. That'll do the trick... hehe. Nothing a few 100 metres of duct can't fix....


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PostPosted: Dec 6th, '07, 11:40 
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if you want to use THE ductape nitto is the best IMHO and cheap when you buy it from an AC ductwork supplier :)

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 Post subject: Re: Scott's system
PostPosted: Dec 6th, '07, 12:22 
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Liner held on with gaffa tape, covered with duct tape.
Will do something more permanent (maybe 19mm poly)
One day ......

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PostPosted: Dec 6th, '07, 14:16 
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If it ain't broke, don't fix it....


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 Post subject: Re: Scott's system
PostPosted: Dec 6th, '07, 15:13 
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Gravel BED - bad AP pun.

but, good for washing gravel..


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PostPosted: Dec 6th, '07, 18:44 
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I will be interested to see what your ph does with using the quartzite/marble gravel. I would imagine it will be well buffered. From memory I was supposed to take a hit for the team and do a bed with similar material as a test. I have a pile of it up by the shed so maybe just maybe....

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 Post subject: Re: Scott's system
PostPosted: Dec 7th, '07, 07:45 
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Good point about the marble pebbles.
I chose the pebbles because they are round and I was worried about sharp edges puncturing the 0.5mm PVC liner.

However, now I have played with it. I realise the following.

1) It is very smooth - bad for bacteria growth
2) Might make the water too hard - marble being CaCO3
3) It varies allot in size (maybe 5mm to 20mm) bad for root aeration ?

So I might mix in a little Hydroton for the bacteria.

On the other five GB's. I'll try a thicker liner (don't know how well it will shape into a round tank?) and use regular gravel (blue metal / screenings).

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 Post subject: Re: Scott's system
PostPosted: Dec 7th, '07, 12:15 
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Having said all that, it is nice on the hands (and looks good)

Anyone got any thoughts / experience on river pebbles ??


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PostPosted: Dec 7th, '07, 12:24 
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we've got screened gravel from sand that is extracted from rivers, so technically that is river gravel. It's fine, it's gravel and it does the job.

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 Post subject: Re: Scott's system
PostPosted: Dec 7th, '07, 13:25 
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Hi Scottt,

scottt wrote:
Anyone got any thoughts / experience on river pebbles ??


One word ... heavy! Sorry, I still have to carry & wash 1 more tub of river rocks. It's making me focus more on some attributes (ie weight) than others (ie. good medium for bacteria & plants).

By the way, your gravel doesn't look TOO smooth - plenty of places for bacteria to live me thinks. (Not like those ornamental Japanese rocks.)


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PostPosted: Dec 7th, '07, 20:01 
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also you should take into account what steve has said in this thread

http://www.backyardaquaponics.com/forum ... 7150#87150

i wouldnt be too woried about your bacteria


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PostPosted: Dec 8th, '07, 04:31 
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Don't sweat it. I have found almost anything will work for medium unless it is toxic.

You could make all the gravel same size by using your bed with a course screen to allow the correct size rock to fall through. You would need more gravel and would have to find a use for the bigger stuff.


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 Post subject: Re: Scott's system
PostPosted: Dec 8th, '07, 09:52 
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Hi all,
Thanks for that, looks like I'll give the river pebbles a go.
Better start washing.........

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