1.Filter cartridges are recommended to be changed every 30 days To achieve good filtration results2.The filter may be a little powder when it leaves the factory which is normal.The new filter is recommended to be used after soaking in clean water for 2 minutes.Material:plasticcolour:WhitePackage Contents:2 * Filter core2 * filters1 * tubeOnly the above package content other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.