Guppyfriend Washing Bag to Reduce Microplastic Pollution 5 "Effective" Jennifer Kirby 24 June 2019 I have a twin tub washing machine so I didn't put the clothes in the bag. I made a funnel of it over the sink edge and used it to filter the water being pumped out of the spinner and emptying the tub at the end. It filters a lot of gunk. I leave the bag to dry then I brush the dry gunk off the inside of the bag and vacuum up anything that landed on the floor. The only tricky bit is holding the bag away from the drain or it holds the water back. It's so nice to know that I am now able to protect the environment instead of feeling guilty.