FOOD GRADE MATERIAL-Made of 100% high quality coconut carbon. STANDARD-Fits all standard 10″ sized big blue filter, size at 4.5″ diameter x 10 height. Function-Carbon block filter is used to remove Remove chlorine, taste & odors, very fine particulates. Life time:6-12months, these can be used for residential and commercial applications. GOOD PACKING-All Filters are individually wrapped&sealed and extend shelf life. FEED WATER PRESSURE: 40 – 100 PSI. TEMPERATE:40-110°F/5-45°C, PH:3.0 -11.0. MAX TDS :1000 PPM, TURBIDITY. Shelf life: 3 Years. What is dimension of a Geekpure Replacement Water Filter? It is 4.5″ODx 10″ height and standard. What is the function? Carbon block filter, Remove chlorine, taste & odors, very fine particulates. If not Geekpure, the filters is available to other brands filter? Please don’t worry. It compatible to most 10inch standard sized big blue housing, includes Ispring, Express Water, Culligan and more brands. What is in the box? 12pcs Carbon Block Filters. The Life Time of the Filter Cartridge Depends on Usage Amount and Feed Water Quality. It Is Normal for Some Black Carbon Fines to Appear in the Water When Emptying the First 3 Gallons of Water. The First 3 Gallons of Water Produced Should Be Emptied and Not Used. Push the Tubing All the Way in and Use Teflon Tape During Installation.