Water purification: The granular activated carbon is made from natural coconut shells, and can reduce PFAS substances, providing you with cleaner and safer water. Please confirm whether you are allergic to it. Keep water fresh: Enjoy fresh and clean water by replacing your filter every 6 months or 10,000 gallons, whichever comes first will vary based on water condition. High-quality filters offer you clean and refreshing water. Customer service: We care about you. If you have any issue about the product, please let us know. We have a quite professional customer service team and we will take care of it right now. Compatible models: AQ-4125, AQ-4100, AQ-4100NSH and AQ-4105 shower filters. Jonathan Product Beauty Water shower filter system. Water purification: the granular activated carbon is made from natural coconut shells, and can reduce PFAS substances, providing you with cleaner and safer water. Please confirm whether you are allergic to it .