It's a growing problem here in the US as well (speaking about Illinois specifically. My understanding is that PFAS can be filtered with active carbon filtration/reverse osmosis filtering.
Reverse osmosis filtering is brutal though. I think the most efficient ones are still like what, 1:2? 2 parts waste per one part clean water produced? It's a lot of wasted water. Even if it was 1:1 it would be terrible, that's doubling water usage.
Fine for drinking water, but showing/toilets/machines it's a lot.
They are 1:2 parts when filtering out salt water, because they need to clean out a lot of salt being concentrated before membrane. When filtering clean drinking water containing promiles of pollutants, the ratio would be much better.
