According to one 2016 study, as many as 700,000 fibers could be released per wash.
When washing clothes made from synthetic fabrics, e.g., polyester or nylon, use a washing bag — like a Guppyfriend bag — to catch microplastic fibers that would typically go down the drain and end up in our waterways. According to one 2016 study, as many as 700,000 fibers could be released per wash.