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 Post subject: dwc bed airation
PostPosted: Aug 2nd, '13, 14:25 
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Hi all I have a 9m x 1m raft and having troubles trying to get air evenly spread across the bed.
has anyone else got around the same size bed and how did you do it.
just thought id ask the question instead of trial and error.

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 Post subject: Re: dwc bed airation
PostPosted: Aug 2nd, '13, 14:40 
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I would use some of these sort of things.
http://www.livefish.com.au/accessories/ ... -foot.html

Perhaps you could even try buying some "dripper hose" and get the same effect, but on the scale that you choose.

As a $7 experiment, you cant go wrong.
http://www.bunnings.com.au/products_pro ... 30205.aspx


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 Post subject: Re: dwc bed airation
PostPosted: Aug 2nd, '13, 14:56 
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It doesnt really matter too much about evenly distributing areation throughtout the raft. Once the water has reached its saturation point, any additional air is simply wasted. So effective aeration in your FT will be doing most of the work.

Ive trialled using air stones in my raft and then none at all over a period of months and I couldnt tell any difference at all. Id say with a 9m raft it would pay to introduce aeration but I wouldnt fuss on trying to aerate every inch of it.

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 Post subject: Re: dwc bed airation
PostPosted: Aug 2nd, '13, 15:53 
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Yeah Yavimaya I have that green see through soaker hose atm but It doesn't really work it just seems to float maybe more bricks to hold it down but ill go have a look at that other stuff tomorrow and Charlie sorry if this sounds stupid im new to all things fish and gardening but your saying if the FT is really well aerated thir is no need to have air in the beds (in a smaller situation I mean) so no need for so much bubbles in the water as long as the water is really aerated sorry I need lamens language.i also have a 70L a min air pump do yous think that's big enough.
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 Post subject: Re: dwc bed airation
PostPosted: Aug 2nd, '13, 17:46 
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All good mate! :)

Yea, thats basically what Im saying. I would need to know more about your system to say for sure but if you have more oxygen going into your FT than the fish or biofilter require than that will stay with the water onto your raft to be utilised by the plants.

But yea, will need to know more about your set up.

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 Post subject: Re: dwc bed airation
PostPosted: Aug 2nd, '13, 18:26 
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If you don't mind mate I have a 1800L FT to solids filter to finer filter through to to bed I was told I wont need a bio filter apperantly the raft will act as a bio


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 Post subject: Re: dwc bed airation
PostPosted: Aug 2nd, '13, 18:30 
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I would aerate the trough a minimum of every 4' (starting 2' off sidewalls).


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 Post subject: Re: dwc bed airation
PostPosted: Aug 2nd, '13, 18:33 
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The raft will act as a bio filter though adding a seperate bio filter inline after the fines filter offers a bit more control. If you ever need to take the raft offline you can valve back to your sump to operate as a standalone RAS.

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 Post subject: Re: dwc bed airation
PostPosted: Aug 2nd, '13, 19:16 
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Awesome thanks mate look like i have something to do tomorrow


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 Post subject: Re: dwc bed airation
PostPosted: Aug 7th, '13, 18:52 
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The thing to remember is plants require about 2 - 2.5mg/L of oxygen to survive and flourish and plants dont take oxygen directly through the root zone so having a raft bubbling through the length of compared to a well oxygenated system will have little to no difference.. Microbes and bacteria etc require about the same oxygen demands to plants at about 2 - 2.5mg/L. Fish need about 4mg/L of 02 so you will find that your fish will suffer before your plants do.

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 Post subject: Re: dwc bed airation
PostPosted: Aug 8th, '13, 07:35 
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Charlie wrote:
The thing to remember is plants require about 2 - 2.5mg/L of oxygen to survive and flourish and plants dont take oxygen directly through the root zone so having a raft bubbling through the length of compared to a well oxygenated system will have little to no difference.

I disagree! Saturation, agitation and good filtration. Boom.

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 Post subject: Re: dwc bed airation
PostPosted: Aug 8th, '13, 11:13 
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We didn't aerate our troughs at all... :dontknow:

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 Post subject: Re: dwc bed airation
PostPosted: Aug 8th, '13, 11:19 
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Seriously, this cant be healthy.
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I'm with Ryan on this one. Especially because hydroponic raft systems often need to aerate DWC tanks and once the water leaves the raft it most often goes to the sump and then FT. Much better to add saturated water to your tank than not.

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 Post subject: Re: dwc bed airation
PostPosted: Aug 8th, '13, 12:12 
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I agree that saturation and aggitation would be a couple of key points when operating a system that needs to pay a return, I suppose it removes margins of error.

My only point is if you are saturating the source water ie fish tank, then that saturation will carry on through the raft with minimal drop thoughout and at the other end. You are saturating a body of water that is turning over continually and the plants only consume very low amounts in the form of food molecules. How much 02 the bio filtration within the raft requires relies on many factors. Depending on temps, total water saturation is somewhere between 8 - 11mg/L and fish only require half this.. and plants half again.

Plants use oxygen in order to fully oxidize and thus fully extract the energy from organic food molecules. Plants themselves don't actually take in oxygen, they get it from the CO2 that they break down. During growth, in the daytime, plants also photosynthesize. When photosynthesizing, plants often make more O2 than they use, but they are still using O2.

Im open to all points of view on this and I trust all of your knowledge, hopefully I can just fuel the conversation so we can all benefit.

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 Post subject: Re: dwc bed airation
PostPosted: Aug 8th, '13, 12:33 
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Would aerating the DWC have an added/side benefit of stopping particles from settling where they could later get caught on the roots? I know that there is filtering prior to the rafts but wouldnt lots of bubbling help any stray particles return to the FT and filters again? I am just guessing here... :D

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