Step 2: water circulation

The circulation system consists of dripping pipes supplied by four 12vdc submersible pumps, and some colIecting pipe for sending water back to the fish in tank.
I drilled 4mm holes in the drip pipes to permit pass throught water and bigger holes in the   collecting pipe  accommodate the bottlenecks. Some connections between pipes are made with water hoses.
three pumps take water from the filter that is connected to the fish tank,  the other from rain barrels placed on the east side of the building. In this way, i try to compensate for the water lost to evapo-transpiration, soil absorption and any  little losses of the circulation , without having to refill it manually.
In the south side, after crossing the planters, the excess water is collected and conveyed to the drip pipe below and from there through the planters arrive in the fish tank. In the  west side, after passing through 2 rows of stacked planters, water flows through "the  green window" of  sedum plants and then passes into the main collecting pipe and in the fish tank. After passing into the bio filter, the water begins a new cycle.

<p>try this. I'm using this type now</p><p><a href="http://www.ebay.it/itm/1pc-12VDC-1-2A-Micro-Submersible-Motor-Water-Pump-14L-Min-840L-H-5M-Size-98-38mm-/200962211181?pt=LH_DefaultDomain_0&hash=item2eca47fd6d" rel="nofollow">http://www.ebay.it/itm/1pc-12VDC-1-2A-Micro-Submer...</a></p><p>the specs are the same of the orange one</p>
<p>thank you for your innovation -- I don't live in Italy so I am not sure what size of bottles are you using - is it 1litre, 2 litre or something else? </p>
<p>Sorry for the delay!</p><p>the bottles are 18l.</p>
Hi Thanks for interest. The bottles i used are 18 liters....
<p>Can you estimate the GPM on these pumps, I'm trying to figure out the ratio between your garden's size to the pumps GPM. understand you only run one minute in the morning and one at night. With a variety of pumps I'd like to have a better chance of ordering the right one on the first try. thanks</p><p>I realized i posted this question on your original instructable, figure you may see this one first since its newer. Thanks again</p>
<p>don't the felt sacks wick the moisture away? I suppose if it's all rainwater there's no fear of being wasteful.</p>
<p>Instead of using a compressor might I suggest creating a small venturi instead of air stones. It is free and you can get rid of the compressor </p>
<p>many thanks, next year i will try venturi effect with a dedicated pump inside fish tank , I think is an elegant and more simple solution..</p><p>Ciao</p>
<p>a word of warning about these systems: contamination and infection can easily spread as the nutrient solution makes its way through the system if not carefully managed</p>
<p>Thanks for the advice. </p><p> However I think that this system is less sensitive to suffer infections compared for example to hydroponic systems, where the roots are supported by a growing medium where the water is circulated continuously. </p><p>Please specify better the contamination of which you speak. </p><p>Ciao</p><p>tiero</p>
Because your water is trickling from one plant to the other, there is the potential of transferring various root infections from plant to plant if it ever takes hold, even though you are using a soil growing medium. This is also especially of concern because the top row is exposed and vulnerable to run-of from your roof...especially bird feces from birds perching on the edge of the roof and pooping on it. Though bird excrement can be used as a good fertilizer after it has composted, fresh excrement can carry disease.
<p>I'm really impressed with the quality of work, last year the project had just taken shape, but the improvements of this year and the addition of the bio filter, brought the project to the next level. I vote your project with the curiosity to see the following improvements. Have you ever considered a greenhouse. Bravo Tiero</p>
<p>thanks, MrCana.</p>
<p>This is impressive and inspiring. I will undertake a similar project in our province in Philippines and i will post progress. More power and we pray for your success.</p>
<p>Thank you tizart.</p>
<p>thank you. </p>
awesome inspiration
<p>thank you.</p><p>T.</p>
<p>Just take off my hat... Work just gigantic. I passed something similar... Though at a smaller scale.</p>
<p>Thank so much..</p>
<p>Per favore. Io continuo a lavorare in questa direzione. Solo il clima da noi &egrave; un po ' l'altro...</p>
<p>Ok, that's why you put the alu foil around the bottles, right? </p><p>Maybe you can built a little greenhouse around your setup and install a secondary water circuit with water warmed by a thermal solar panel.</p><p>In Iceland they grows banana tree like this using geothermal. </p><p>Bye.</p>

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