Clogged filters or limescale are the top causes for slow RO water flow.
- First, check filter age. If they're expired (PP, CTO, PCF >12 months, RO >24 months), replace them.
- Descale the unit. Mix a descaling solution (50/50 white vinegar and water) in the water tank. Run a 1.5L filtration cycle, stop it midway, and let it soak for 10 minutes. Pour out the solution, then run 3+ cycles with tap water to rinse.
- Perform a manual backflush. Press the water volume and water-making buttons simultaneously for a 1-minute backflush to clear contaminants.
If the flow is still slow, ensure your input water temperature is between 41–100°F (5–38°C). Colder water slows the rate. Also, the pure water rate is 0.26L per minute under ideal conditions (0.2 MPa pressure, 25°C). Lower pressure or temperature will reduce speed.
Never reuse RO reject water. The contaminant accumulation will clog filters faster.