The replacement filters for the TFC-25S RO System are:
Sediment/Carbon Pre Filter: S7028 - https://www.filtersfast.com/Microlin...er-filters.asp
Activated Carbon Post Filter: S7025 - https://www.filtersfast.com/Microlin...er-filters.asp
Membrane: S1227RS - https://www.filtersfast.com/Microlin...r-Membrane.asp