Fangrui Product Details New Upgrade: The Water Filter With An Additional Layer Of Rubber Seal To Ensure That Unfiltered Water Will Not Leak. The Housing Of The Water Filters Are Made Of Environmentally Friendly Food-grade Plastic, Which Is To Ensure Safe Filtration. Multi-layer Filtration: Our Water Purifiers A Multi-layer Filtration System That Uses Activated Carbon And An Ion Exchange System To Reduce Odors. We Add More Resin Than Other Brands Of Filters To Speed Up The Ion Exchange (if You See A Large Yellow Substance In The Filter, Thats The Resin), Which Effectively Reduces Tds And Reduces Calcium, Magnesium, Chlorine And Other Ions In The Water. Please Note: The Actual Filtration Effect Is Affected By Your Region. Protect The Environment: One Zero Water Filter Can Continuously Filter Approximately 40 Gallons Of Water, Which Can Save You Money On 500 Bottles (300ml Bottle) Of Drinking Water. It Also Reduces The Use Of Plastic And Protects The Environment. Models: Our Zero Wat