HIGH COMPATIBILITY: Compatible with Pioneer Pet plastic fountains, including #6024, #6029 Raindrop; #3003, #3004 Feng Shui; #3040 Serenity; #6005, #6028, #6031 Magnolia cat water fountain dog water dispenser. Also compatible with EveryYay Get Fresh ceramic cat water fountain. NOT compatible with stainless steel or ceramic-based Pioneer Pet fountains 12-PACK VALUE: Includes 12 replacement filters (4.5" x 2.4" x 0.2"), to meet your long-term replacement needs. Perfect for consistent use with plastic pet fountains MULTIPLE FILTRATION: The replacement carbon filter for plastic pet fountain is filled with premium coconut shells activated carbon and non-woven fabric for enhanced filtration. Traps hair & debris, removes impurities & particles, and softens tap water—keeping fountain water clean and fresh PROTECT YOUR PET: Made with safe, odorless materials designed for reliable filtration. The cat water fountain filter replacement filters heavy metals & odors, improves water taste, and supports pet's urinary tract health for overall well-being REGULAR REPLACEMENT: To ensure the health of your pets and maintain filtration efficiency, please maintain the habit of replaceing the premier pet fountain replacement filter every 2-4 weeks (adjust based on pet count/size) EASY TO USE: Rinse pet water fountain filters before use to remove loose charcoal. Simple to install into fountain grooves. Note: Check dimensions against the product image before purchasing to ensure a proper fit for your pioneer pet fountain or EveryYay model Activated carbon filters should be changed approximately every 2 to 4 weeks (depending on the size and number of pet using the fountain).