Why 
If you wear any polyester, have fleece, or have any synthetic fibers in your clothes, this item is a non-negotiable must-have for everyone who wants to live in integrity as a pro-earth person. Micro-plastic leaching from laundry washing is a sleeping giant of oceanic harm. It's not as hot of a news topic as global warming, but it's horrendous and some news coverage discusses it. In case you haven't heard, our current water treatment facilities do not catch microfibers that are shed when washing clothing. These fibers easily make their way to the ocean where microscopic organisms mistake them for food. These little creatures are then eaten by larger creatures, and so on, until plastic is what's served at meal-time. 

When a load of laundry is done, you can see the microfibers the Guppyfriend bag collects. It may not seem like much, but if you picture billions of people washing clothes every week and not doing this, the impact is huge. That's the issue. 

Effectiveness and Comparison with Other Products
Earth Hero sells a microfiber reduction product, but I don't think it's worth your money. It is not nearly as effective as the Guppyfriend. The one at EarthHero catches less than a 26% of microfibers leached during washing as opposed Guppyfriend's to 79–86%, depending on fabric composition. All fibers retained is above 90%.It cannot hold back nanoparticles. Further, Guppyfriend also protects garments during the wash so your clothing lasts longer, as opposed to the product sold at EarthHero, which has a warning that it will get caught in more delicate clothes (which are often made out of synthetic materials). Guppyfriend costs $29.75, whereas the product at EarthHero costs $37.99. Both brands recommend multiple products for larger loads. For Guppyfriend, four bags is enough for a large load of laundry. The EarthHero product recommends three.. Guppyfriend does not need cleaning after each use, EarthHero's does. Guppyfriend is made from new material, Earthhero's is made of recycled material. Both are recyclable. On 2/2/2020, the date this store was opened, I contacted EarthHero to see if they'd offer Guppyfriend—news as it breaks.

Instructions
Place clothing in bag until it's 1/2 full and place in washer and wash as normal. When wash is done, remove items from bag and dry as normal. I do recommend air drying for lack of the carbon footprint and to make your clothing last longer.

Vetting
I have used Guppyfriend bags for years for all my washing and have four to handle a large load of laundry. 

Non-affiliate Disclosure
I do not have an affiliate link with Guppyfriend. I asked, but they said their margin is so narrow, they do not offer one. Patagonia also sells these for the same price. I am not an affiliate with them, either. ​