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My Take on Floating Raft
http://backyardaquaponics.com/forum/viewtopic.php?f=1&t=25480
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Author:  activetechnologies [ Jul 10th, '15, 13:44 ]
Post subject:  My Take on Floating Raft

Haven't seen a floating raft with these materials before, so here's my take on it:

Image

I used a chicken wire fencing of sorts and zip tied it to the top of the grow bed. Then cut out holes for the plastic pots.

Figured this way dont have to worry about styrofoam breaking off

Author:  Yavimaya [ Jul 10th, '15, 14:34 ]
Post subject:  Re: My Take on Floating Raft

but you will get zinc in your system, i wouldnt say you will get heaps straight away, but it will come with water flowing over the metal, also when it rains, condensation at night, etc.

Author:  Stuart Chignell [ Jul 10th, '15, 16:43 ]
Post subject:  Re: My Take on Floating Raft

+1 Y

Not a good idea.

The zinc will kill your fish.

Sooner or later.

Author:  activetechnologies [ Jul 10th, '15, 22:36 ]
Post subject:  Re: My Take on Floating Raft

Damn... fail!

Author:  cathode [ Jul 10th, '15, 23:18 ]
Post subject:  Re: My Take on Floating Raft

It's not a bad idea though. And there is wire mesh available from home improvement stores that is meant for reinforcing concrete, it's raw untreated heavy-gauge steel wire. But the squares are much larger. It might work though.

Author:  scotty435 [ Jul 10th, '15, 23:51 ]
Post subject:  Re: My Take on Floating Raft

Maybe switch to an egg crate light diffuser grating if you like that open mesh. I prefer to block the light because this reduces algae growth.

Author:  dasboot [ Jul 11th, '15, 10:19 ]
Post subject:  Re: My Take on Floating Raft

And you miss out on the surface area of the floats in contact with the water which get colonised with nitrifying bacteria.

Author:  scotty435 [ Jul 11th, '15, 12:12 ]
Post subject:  Re: My Take on Floating Raft

And also the insulating qualities of the styrofoam :dontknow:

Author:  MambaJack [ Jul 12th, '15, 23:58 ]
Post subject:  Re: My Take on Floating Raft

I would also be concerned in the initial stages at least about the amount of sunlight that gets to the water to grow algae.

Author:  Jacko [ Jul 13th, '15, 06:51 ]
Post subject:  Re: My Take on Floating Raft

+1 for a good effort. I would also not have thought about the sink in the system

Author:  activetechnologies [ Jul 17th, '15, 13:51 ]
Post subject:  Re: My Take on Floating Raft

Well everyone, I appreciate your input! Saved me from some dead fish.

I ended up going back to styrofoam. To make the job easier, I purchased a 4" hole saw drill bit to make the holes. Took me 5 minutes as opposed to 2 hours when I last made one of these!

Thanks again for the help

Author:  cathode [ Jul 17th, '15, 14:06 ]
Post subject:  Re: My Take on Floating Raft

Tip: Don't use Expanded Polystyrene Foam (EPS), the round cells easily break apart and it is difficult to get clean cuts. Extruded Polystyrene Foam (XPS) boards cost slightly more, but have a uniform consistency and cut cleanly. They're stronger and will last much longer as well.

Author:  Stuart Chignell [ Jul 17th, '15, 14:34 ]
Post subject:  Re: My Take on Floating Raft

EPS can work quite well but you need to get the high density stuff. Most people use the low to medium density stuff which is no way near as good or durable.

Author:  cathode [ Jul 17th, '15, 15:01 ]
Post subject:  Re: My Take on Floating Raft

Stuart Chignell wrote:
EPS can work quite well but you need to get the high density stuff. Most people use the low to medium density stuff which is no way near as good or durable.


Not sure about density, expanded all behaves the same. Extruded is still polystyrene, just manufactured differently, which is why I suggested it.

Author:  Haleyk [ Oct 5th, '18, 19:16 ]
Post subject:  Re: My Take on Floating Raft

I'm at a battle with the use of Polystyrene for float boards - it seems to be the best choice for blocking light, being neutral and for floating - but it's the most non eco-friendly...which is kind of sad because of the principals of aquaponics being sustainable.

How long does the Polystyrene boards usually last in a AP DWC system? Knowing that it lasts a long enough time might help with justification...?

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