EASY TO USE: Just put the sponge in a water filled pool, tub then sponge can help you to clean the pool by itself without any other difficult set up, and soak up so many things you don't want in your water APPLICABLE SCENARIO: The sponge can collect the scums, slime, grimes, and oils that right out of water and save the life of filters, useful and practical HIGH EFFICIENCY: Oil absorbent sponge help eliminate scums that form in swimming pools, hot tubs, jetted tubs and spas, prevent the formation of a scum line in your pool or spa USEFUL AND EFFECTIVE: The hot tub sponge use efficient adsorption technology to ensure that oil and impurities are effectively removed from the pool water RELIABLE MATERIALS: Pool filter sponges are made of excellent sponge materials, long lasting and wear resistant, ensuring a reliable and efficient pool filtration system Item Type: Hot Tub Sponge Quantity: 10Pcs Material: Sponge Use: Household Applicable Scenes: Most scenes Size: Approx. 8.3cm / 3.3in 10 x