Did you know this ............the story of Poly-filter

Did you know this ............the story of Poly-filter

https://www.youtube.com/watch?v=91UfS5uAz1g

 

Pretty cool story.......

What colour means what......

 

 

Pros and cons

https://www.youtube.com/watch?v=ybjdnFoUNl8 

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