iSpring RCC7 Annual Filter Replacement Kit
iSpring's annual filter kit for the RCC7 (FRK-RCC7, $40--$55) includes all pre- and post-filter stages excluding the RO membrane. This is the best annual maintenance value in the under-sink RO category -- a complete set for under $55 covers all stages that require annual replacement. The kit includes: 1x sediment filter (FP15X1), 2x carbon block filters (FC15X1), 1x post-carbon polishing filter (FC15X1C), 1x alkaline remineralization filter (FA15 for RCC7AK). RO membrane replacement (MRO-75 for 75 GPD, MRO-90 for 90 GPD): every 2--3 years at $20--$35. iSpring filters are available on Amazon (Prime eligible), Home Depot online, and the iSpring website with a 1-year replacement warranty.