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José Pedro commented on Artificial Reefs and coral

Hello Angel,
I saw your project and I was thinking about the possible consequence of the use of grinds mixed with concrete in salt water.

Concrete has, at best ipoteses, a durability of 10/100 years depending on the mixture (chemical) used. When in contact with salty water, the durability should come down steeply.
 - https://www.tandfonline.com/doi/pdf/10.1080/19373260.2010.521048

However rubber and other plastics may take 20/1000 years to decompose.
*one reminder, most of the rubber used in the manufacture of soles is not natural but rather synthetic, so it uses above average chemicals

In the short term, I believe it works and is feasible once the corals disappear with each passing day, but in the long term I foresee a series of particles and pieces of these grinding beings dragged by the current serving as food for marine life.

Do not be discouraged, test, have proof that I'm wrong. I really want to follow your project. Good luck.