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l - Refinement
Stabilized organic matter from the composting or aerobic stabilization stage arrives here. This material, once stabilized and matured, still contains a significant amount of inert and improper materials which need to be separated in order to obtain a final product of the greatest possible quality.
To achieve this, the stabilized product goes through a vibrating sieve and a densimetric table which ensures the product is apt for its end use.

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| Refinement process
| Biostabilized material
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