PETSTANDARD Replacement Filter Compatible with Catit® PIXI™ Water Fountain.
Filter Measurements: 3.31" x 3.31" x 0.375".
To prevent the activated carbon dust from shedding into water, please soak the filter in water for 2 minutes then rinse thoroughly under running water before using.
Replace the filter every 2 to 3 weeks in summer and 3 to 4 weeks in winter. If multiple cats are using the fountain, more frequent replacement will be necessary.