The Guppyfriend is a washing bag that captures the micro plastic from your laundry and stops it from ending up in the ocean. This is how you use it:

You find it here: Tise Basics Guppyfriend

You can also read more about it on Guppyfriend's own web site, they have a very thorough and well written FAQ site: https://en.guppyfriend.com/pages/haeufig-gestellte-fragen-faq-fragen-und-antworten-q-aGuppy Friend FAQ