I had no clue these existed but it is a relief to know these steps are being taken! I am not always a big fan of technology but these inventions amaze me.

On the flip side, we should be concentrating on reducing the pollutuon just as much as cleaning it up. Prevention is the best medicine.

Secondly, These take up space and, I imagine, consume resources and create pollution and waste to manufacture the filters. Works against each other.

Thanks so much....I learned something new already today.