Package: The package contains 6/12 pack replacement filters for CENGCEN cordless cat Water Fountain WF230. How to use: Keep water tasty and clean by swapping out your pet fountain filters every 4 weeks, more often if you've got lots of cats. Before putting in a new filter, give it a good rinse and pop it into the cat fountain. Keeps Water Clean and Fresh: Our filter, made with high-density material, uses silver, coconut shell carbon, and a special scale stopper to give your pets pure, refreshing, and tasty water. Superior Filtration Performance: Our refined coconut shell activated carbon boasts an advanced pore structure that outperforms standard activated carbon. It absorbs impurities rapidly, lasts longer, and excels at filtering contaminants from water. Reliable material and service: This filters for cat water fountain is made of BPA-free material, which will not affect your pet's health. In addition, we are committed to providing excellent service to our customers. If you have any problems during the use, please contact our after-sales team and we will provide you with a satisfactory solution.