Replacement and cleaning intervals
Membrane and filter lifetimes depend on feedwater quality, system design, and maintenance practices. Typical guidance:
- Sediment and cartridge filters: Replace every 1–6 months depending on turbidity and pressure drop.
- Activated carbon filters: Replace every 6–12 months or when taste/odor issues reappear.
- Pre-treatment media (sand, multimedia): Backwash and periodically replace media every 2–5 years.
- RO membranes: Clean chemically as needed (every few months to annually) and replace every 3–7 years depending on fouling, scaling, and system stresses.
Maintenance signals and monitoring:
- Pressure drop across filters indicates replacement timing.
- Decreases in permeate flow or increases in permeate conductivity suggest membrane fouling or failure.
- Routine water tests and maintenance logs inform optimal cleaning schedules.
Proper pre-treatment dramatically extends membrane life. Stocking spare filters and membranes and training operators in cleaning protocols reduce downtime and lifecycle costs.