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Angelika Maier
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There is this really cool video of a compost tea brewer, but he does not show how it looks from the inside.
webpage
He's making a spiral out of conduit and drills holes in the spiral, but how many rounds does the spiral have?  Can anyone show me a picture?

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While I cannot help with your question, I found this website from MIT with that YouTube.

https://www.mti.edu.eg/upload/libfiles/0/0/15.html?video=fg3F6gAi5Qg

It also has several DIY Compost Tea Brewers that might be of interest to you.

https://www.mti.edu.eg/upload/libfiles/0/0/15.html?video=JCK_pjcQOTo

I also found this thread that sounds to me that it would be useful:

https://permies.com/t/96773/composting/Compost-Tea-Brewer-affordable-DIY

Even if this information is not useful to you I bet since threads are perennial this might help someone in the future.

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Ben Zumeta
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Looks a lot like the “Bubble snake” by TeaLab:
https://www.composttealab.com/store/p2/compostteaaerator-bubblesnake-by-tealab.html

I have one, and it works well with easy cleaning. They also have some good info and recipes.

I am not sure who came up with the design first.

This is all just my opinion based on a flawed memory

 
Angelika Maier
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yes it's the bubble snake! I was madly busy and did not get to it until now...

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Angelika Maier
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Doing that coil was way not as easy as thought. I did not have a gas flame (don't want to do that in the house) so I built a little fire. Conduit does not bend very easy and the first attempt failed as I burnt a hole. In the video at 4:10 you actually can see the snake very briefly. Also the material has memory and it wants back in the previous shape. Probably gas flames are hotter. You also will need leather gloves and I actually used welding gloves.

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Ben Zumeta
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Not sure how hot it has to get, but what about bending into a spiral in a 55gal barrel, weighing it down under something like concrete blocks, then submerging the conduit in very hot water? Then let it cool overnight or longer if needed. It would bet it’d hold its shape. That or buy the 30$ bubble snake, they seem like good folks at TeaLab.

This is all just my opinion based on a flawed memory

 
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