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PostPosted: Oct 18th, '10, 07:29 
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Has anyone tried PVC sheets? I'm thinking It would be rather easy to build a raft. Cut your sheets to size, add say a 2 or 3 inch skirt all the way around, build a couple of floats out of PVC pipe with end caps and either glue the floats on or use cable ties.

Just a though that has been ratling around in my head to try when I get home in December.

Scott


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PostPosted: Oct 18th, '10, 19:57 
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I found some live water cress, roots and all, at the supermarket. I stuck one in my outside GB and the other I cut the root ball into 1 inch strips and planted them in raft net pots in the 150 gal fish tank with bubbler and gold fish. After four days those in the raft all have leaves still looking limp, but have not dried out and died. The bunch in the GB look fine.
The price was $2.98 per bunch so was to expensive to buy more plants. My research indicates that water cress prefer cooler temps......should I protect from freezing temps? Will they die back in our hot summers or just go dorment?


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PostPosted: Oct 19th, '10, 18:33 
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viewtopic.php?f=1&t=1728&p=64535&hilit=water+cress#p64535
This might give you some of the answers that you are looking for Spiritrancho! Hope it helps. :dontknow:

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PostPosted: Oct 23rd, '10, 18:10 
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Hi. I have a DWC and I use styrofoam for rafts and they seem to do alright. I choose the higher density type so they last longer. If bamboo is available, you may give it a try.


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PostPosted: Oct 23rd, '10, 18:23 
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By the way, Spiritrancho. Do I understand that you have fish in the veggie tanks? If so, there is no way that the plants will survive because the fish will eat all the roots. Do you have a filter in the dwc system? You need to have one, otherwise, the roots will rot due to the accumulation of muck.


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PostPosted: Oct 23rd, '10, 20:17 
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Yes,I have a dozen two inch feeder goldfish in the 150 gal tank with the watercress in net pots on a raft. As yet the watercress roots havent grown out of the pots. I have no filter but draw off about three gal. of water from the bottom of the tank and pour that on mint in pots. I make up with fresh well water as required. There is no problem with algae growth and the water I draw off is only slightly brown. I do keep a bubler going 24/7.


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PostPosted: Oct 24th, '10, 10:16 
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In a DWC, you can't have fish together with your vegetables. The roots get to be eaten as soon as they are visible to the fish and the plants won't have a chance to grow. An exception is when you need to have a controlled number (may be 2 or 3) of predators like convict cichlids or sunfish to control fresh water snails. A mechanical filter is also a must between the fish and the veggie tanks. This is to remove the floating and suspended solids in the water which can accumulate on the roots and cause root rot. Maybe a simple barrel filled with filter material will do the job. You can check on my CRIS' SYSTEM in the Members' System folder of the forum. Page 7, I think. Good luck.


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PostPosted: Mar 27th, '14, 04:30 
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In my 'day job' we often get large shipments of hard drives from HP and Lenovo. They come in these great big boxes with a 3 inch thick sheet of foam on the tops and bottoms of the box. The foam is just wide enough to sit in my 55 gallon barrel halfs. Free resource. Had to call the vendor to see if the foam was UV stable, and surprise, it is.

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PostPosted: Mar 27th, '14, 10:47 
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hawaiinewbie wrote:
Another solution could be use 3" foam so that the tops are way above the water line....


I use 2inch for that reason,also the pots i use don’t quite go through to touch the water,so roots are in plants out, just the slight wicking that happens.
You can get different grades of foam,the stuff most readily available is quite open in construction and breaks down,you can get really dense stuff i wouldn’t know what they would use it for but its similar to the dense moulded poly you get to secured TVs and stuff for transport.I found some here but it was only 1.5 inch so i stuck with the 2 inch.

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PostPosted: Mar 27th, '14, 21:49 
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5mm or 10mm Coreflute, the 5mm sheets are available at Bummings for around $11 a sheet (1200mm x 900mm). I am planning on using them seated on 8mm stainless solid round bars that will sit about 40mm above the waterline. The Coreflute is non toxic and UV stabalized.

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PostPosted: Apr 1st, '14, 15:51 
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I should give this an update. I have ended my search with 1/2" PVC plywood. It bends a lot so i bolted on aluminum angle iron across 2'x4' sheets to keep it rigid. the boards are suspended over the water so just the bottom of net pots touch water.

I am very happy with this solution. total cost for a 4'x8' bed was $220. A bit expensive BUT it'll last pretty much forever. No more labor needed for a long time. Also VERY easy to keep clean and sanitary.


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PostPosted: Oct 5th, '14, 23:13 
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You wrote "I have ended my search with 1/2" PVC plywood". So did you use a sheet of PVC or is it Plywood? Looks like Plywood that you painted correct? Also, is it sitting on something to keep it afloat?


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PostPosted: Oct 5th, '14, 23:43 
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Does corflu float? You could use ex realestate / election candidate signs. Might need to seal the ends with some silicone.

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PostPosted: Oct 5th, '14, 23:44 
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Could also use pool noodles instead of PVC, lots cheaper.

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PostPosted: Oct 5th, '14, 23:46 
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Derr missed the top replies by hairy camel. Sorry don't know how I missed that.

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