Original Xiaomi Replacement Water Filter Element for Xiaomi Mi Water Purifier Drinking Water Filter (S-CA-3111)1. Compatible with Xiaomi Mi water purifier. 2. Made from superior PP cotton, has strong capacity to resist PM particulate matters about 5 microns. 3. Easy to apply it to your Xiaomi water purifier. Please note that you'd better to replace it 2 4 times a year. Specification: General Material PP Cotton Package Weight One Package Weight 0. 41kgs 0. 91lb One Package Size 34. 5cm * 6. 5cm * 6. 5cm 13. 58inch * 2. 56inch * 2. 56inch Qty per Carton 25