Need To Know Petkit Filter 2.0 Is Designed For Eversweet 1 And 2 Petkit Fountains. If You Have Eversweet Water Fountain 1, Please Remember To Purchase The Tray Together. Filter 2.0 Is Only Compatible With Tray And Fountain 1.0 Stronger FilteringPetkit Filter2.0 Uses Purolite Company'S Filter Material As Raw Material And Increases The Amount Of Filter Material In The Filter Element, So That The Filtration Performance Is Better And Harmful Substances Such As Hair, Debris And Heavy Metals In The Water Are Better Filtered Your Pet Is Protected From Illness. 4 Types Of Filtering The Filter Layer Is Made Of: Two Layers Of High Quality Cotton Mesh, Coconut Shell Activated Carbon And Ion Exchange Resin Please Please NoteBefore Replacing The Filter Element, Soak It In Cold Water For 5 Minutes To Activate The Ion Exchange Resin. After Replacing The Filter Element, Press And Hold The Black Reset Button On The Bottom Of The Dispenser To Turn Off The Orange Indicator Light On The Dispenser. When To Replace The FilterNormally, The Filter Should Be Replaced Every 3 Months In Smart Mode And 1 Month In Normal Mode. The Indicator Will Turn Orange When The Filter Needs To Be Replaced