Back in 2000s, Waste Water Treatment Plants were not designed to remove the micro beads and fibres of all plastic kinds.  With that the fact that WWTP, once built, stays for decades, I do not believe that, unless WWTP is built to specifically designed to remove those micro plastics, are not going to be able to remove any micro beads and plastics.  It may be far too optimistic and illusory to believe that those micro beads and plastics that are often not visible to our naked eyes are removed at any high success rates. even today. Unless removal technology is specifically deloloyed for those beads.

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Back in 2000s, Waste Water Treatment Plants were not designed to remove the micro beads and fibres of all plastic kinds.  With that the fact that WWTP, once built, stays for decades, I do not believe that, unless WWTP is built to specifically designed to remove those micro plastics, are not going to be able to remove any micro beads and plastics. 

It may be far too optimistic and illusory to believe that those micro beads and plastics that are often not visible to our naked eyes are removed at any high success rates. even today. Unless removal technology is specifically deloloyed for those beads.