Grow Mediums How to stop pip blockages in a re-circulating DWC

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Hi Guys, I have a question I hope someone can give me some tips on.

I am currently growing a think different in a single 20 litre DWC.

https://www.autoflower.org/f44/think-different-17683-5.html

On my next grow I plan to use 2 grow buckets with a header tank pumping the water through both grow buckets. the aim is to increase the water volume to keep it a bit more stable with regards PPM and PH.

My question is, what can be done to stop the plant roots growing into the return pipe and causing blockages? I have read bout copper being used, but am unsure how.

regards

Abb
 
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