Microbes and their residue, experienced by humans as slime, which is critical for performing aerobic microbial activity. It takes 4 – 6 weeks to create and 3 – 5 years to reach maturity. It can’t be mimicked by commercial additives. Biofilm forms on plant roots growing beneath the islands. Suspended solids in the water column (organics / heavy metals in the form of particulates) adhere to biofilm and eventually slough off and wind up in the sediment. Provided anaerobic conditions are maintained in the sediment, the particles are effectively sequestered.

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