…that’s one of those films I’m scared to watch :/
Years back, I was trying to understand the problem fully - degradation in performance/durability of C8>C6>C4>C0 treatments, and what the best C0 alternatives are/might be in the future, I read this utterly bleak article;
It’s a very long read, and in a series of chapters lays out how extensive the damage is, in huge areas and communities in the US.
When I have the time I’ll find a good explainer in Performance Days from a someone who works for EU legislation on toxic chemicals - and identifying/phasing out stuff like this - which explains the chemistry behind the C8/C6, the toxicity of the PFOAs used to create them, the alternative types of C0 treatments and why they don’t perform as well.
….look after your waterproofs! Clean, maintain (and reproof) as you would a bike!