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That's interesting. I didn't read through the entire patent journal, but I'm wondering if there is a positive effect from PCL settling into holes in live rock & getting lodged in filter sponges. I would think: yes, there is, since both applications are analagous to being lodged in a gravel bed.
Then again, this test uses round oval balls ~4mm, and the commercially available IO PCL is closer to the size of lead shot. I wish the guy using the DIY Friendly Plastic was able to keep the experiment going.
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