Our 100% biodegradable and compostable Eco-Sponges replace soft plastic sponges at the sink for dish washing. Rub the Eco-Sponge on your Dish Block® and lather up dishes as usual. (Each unit is a 3 pack!) Rinse clean and squeeze dry after using. We recommend replacing it every 3-4 weeks. Once you're ready to replace your sponge, compost the old one. It is completely biodegradable, made of natural plant fiber and doesn't contain any plastics or synthetics.