It filters out hair and dirt to protect the wireless pump and prolong its usage. Easy to install and detach. Compatible with all PETKIT wireless pumps. Suitable for the pump of Eversweet 3 Pro, Eversweet Solo 2, Eversweet Solo SE. Long-lasting and can be changed every 1-2 months to keep the pump and water fountain working well. Material: Foam : Package include: 15pcs