AIR UPlus Premium Platium Charcoal Carbon Filters Replacement Compatible with PetSafe Drinkwell Pet Fountain, 12 Pack

Compatible with the following Petsafe Drinkwell Fountain models: 1.Drinkwell Original 2.Drinkwell Platinium 3. Drinkwell Big Dog 4.Drinkwell Multi-Tier 5.Drinkwell Outdoor Dog 6.Drinkwell Mini 7.Drinkwell Zen Directions: 1.Before inserting them in to the fountain?rinse out with running water. It will clean the filter of any charcoal dust that may have become loose. 2.Insert the filter in to your pet fountain. The flow of water should enter through the polyester side and out of the charcoal side which is dark in color. 3.the filters should be replaced every 2 to 4 weeks and more frequently if multiple pets using the fountain