The U1 Space-Saving 4-in-1 Water Filter System uses quick-twist filters and a hydrogen module that are easy to replace without any tools. Here is when to replace each one and how to do it.
Replacement Schedule
- QT Sediment and Carbon Pre-Filter — Every 6–12 months. This filter removes sediment, chlorine, and particles from your tap water before it reaches the RO membrane. Replace closer to 6 months on well water or high-sediment sources, or up to 12 months on municipal water supply.
- QT Alkaline Post-Filter — Every 6–12 months. Adds minerals back to the purified water for better taste and a healthy pH balance.
- QT 200 GPD RO Membrane — Every 12–24 months. The membrane handles the heavy-duty purification, removing up to 99% of dissolved impurities.
- Hydrogen PEM Module — Every 6–12 months. This module infuses purified water with molecular hydrogen, delivering antioxidant benefits with a negative ORP reading.
How to Replace U1 Filters
- Unplug the U1 from the electrical outlet.
- Remove the supply tank from the base.
- Open the top panel to access the three filter compartments.
- Twist the filter you want to replace counter-clockwise to unlock it, then pull it straight out.
- Insert the new filter and twist clockwise until it clicks into place.
- Repeat for each filter you are replacing.
- Fill the supply tank with fresh tap water to the MAX line before placing it back on the U1.
- Plug the unit back in and run 2 filtration cycles to flush the new filters. Discard this water.
Important: Always fill the tank before placing it on the unit. If you fill it after, the system may not start filtering.
You can find replacement filters here:
- U1 1-Year Filter Bundle
- U1 2-Year Filter Bundle
- Individual filters: U1 Replacement Filters
Need help? Check the U1 Manual (PDF) or contact our team.
Feb 14, 2026