Storage and maintenance methods: 1.The sponge itself is white, and an oxidation reaction will occur when the white object is exposed for a long time. Therefore, yellowing and discoloration are normal phenomena. 2.Vacuum packaging, to keep the sponge flexible, please take out the sponge to place about 20 minutes before use it. 3.Keep the sponge clean, the sponge with sebum dirt will become dirty and hard. At this time, please clean the sponge. 4.Use a neutral detergent, wash under the above pressure, and dry in a cool place. 5.The usual storage method is to place it in a cool place and seal it with color or black bag.which can extend the life of the sponge Specifications: Material: Sponge Color: white Quantity: 20 pieces Size:11.5x11.5x3cm 4.52x4.52x1.18 inches. Package includes: 20 x Oil absorbing spongesWide Application: This pool oil absorbent sponge is widely used in swimming pools, tubs, jacuzzis, Jacuzzis and spas,ect. in order to prevent the sponge from turning yellow before use, please do not put the sponge in the sun. Effective Effect:This oil-absorbing sponge It helps to absorb floating scum, lotion, cosmetic residue, oil stains. It is also very easy to use, you just need to put the sponge into the pool or bathtub to let it fully absorb lotion and scum. Easy to Clean: When the sponge gets saturated, simply squeeze out the oil, rinse out the sponge, and use again. It would be at better performance after cleaning the sponge.hot tubs, jetted tubs, and spas, prevent the formation of a scum line in your pool or spa. Size: The size of each oil absorbing sponge is about 11.5x11.5x3cm 4.52x4.52x1.18inch. The appropriate size and simple design provide you with an easy way to clean and maintain your swimming pool area and other areas. Material: The foam scum float balls are made of polyester material, compared to other oil absorbing sponges on the market,You can also use it to clean your swimming pool. You can also use it to clean your washing machine, bathtub, spa, etc.