General description The 4 Sets Flower Fountain Filters for Cats include 4 carbon filters and 4 foam sponges designed specifically for 2.1L cat fountains, including the PLWF002 model. These filters are crafted to enhance the quality of your pet's drinking water by effectively filtering out dirt, pet hair, and odors. Technical specifications Replacement filter size: 18.0 x 9.5 cm Sponge size: 2.5 x 2.0 cm Compatibility and accessories Compatible with 2.1L Round Cat Fountain Compatible with PLWF002 model Installation Place the raised side of the filter up and the flat side down for easy installation. Rinse the filter with water before use. Usage It is recommended to change the replacement filter every 2-4 weeks to maintain clean water for your pet. Other information Hantoc prioritizes the health of pets' drinking water, encouraging pets to drink more water.