Easy to use and change!

This product is very easy to use and install; the trickiest part is removing the upper plastic portion of the fountain I install these in. Run under cold water for 30 seconds prior to installation to prime it and don't worry if there's a minimal amount of carbon dust that shows in the sink. I install these filters into the "PetSafe Drinkwell Multi-Tier Dog and Cat Water Fountain." Given the interior structure, the filters are held in a curved position. I recommend bending these filters gently into thirds to help the filters sit flush within the brackets inside the fountain. These filters consistently last about two weeks running constantly in 100 oz. capacity water fountains.

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