This Pioneer Pet Replacement filter works for the Raindrop Ceramic, Raindrop Stainless Steel, Big Max Ceramic and Big Max Stainless Steel Fountains.

Fountain Filter Replacement 3-Pack by Pioneer Pet
Works in all pet fountains using the pictured filterAt Pioneer Pet we study animal behavior and animal needs closely. Moving water attracts pets, encouraging them to drink often to stay hydrated & healthy. A charcoal filter will help remove odors and keep the cat or dog's drinking water clean and fresh. Routine maintenance of replacement filters will extend the life of a pet fountain. Change the filter every two to four weeks, depending on the number of animals using the fountain.

Product Features & Benefits3 layer filtration system.
Contains granulated carbon.
Uses Duo-Density Polyester Pads.
Keeps water clean & fresh.
Captures hair & debris.
Product Dimensions: ¾” H x 4” W x 2 ½” D
Product Weight: .2 oz.