We do not recommend reusing the sponges as they may not perform as effectively as the first use. Additionally, reusing sponges from previous plants can introduce bacteria and potentially lead to disease. However, the white baskets and blackout covers are able to reuse after a thorough cleaning. To support environmental sustainability, we offer cost-effective sponge refill packs at a discounted price on our official website, www.letpot.com, or the store where you buy your hydroponics system.