Typical replacement stages
| Stage | Typical interval | Role |
|---|---|---|
| Prefilter | About 6–12 months | Sediment/carbon pretreatment |
| Alkaline post-filter | About 12 months | Final polishing / mineral addition |
| 200 GPD RO membrane | About 18–24 months | Main dissolved-solids reduction |
| Hydrogen module | Per RKIN guidance / usage | Hydrogen-water feature |
Why ownership cost matters more on the U1
The U1 bundles RO, remineralization, hot water and hydrogen-water functions into one appliance. That convenience increases the number of proprietary consumables. Before buying, compare the full multi-year cartridge cost—not only the hardware price.
RKIN is available through retailer network, so replacement cartridges are a recurring affiliate opportunity after the original system purchase.
View RKIN replacement filters ↗