This strong and versatile large 25L bucket comes with a Grit Guard Insert. Once inserted into the bottom of the bucket, the grit guard will ensure that all the mucky grim off your mitt will stay at the bottom of your bucket - where it belongs. To use, add a grit guard to your wash bucket, submerge your mitt in the water, and agitate to remove any dirt or grit. For best results also use in your shampoo bucket.