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Deutsch Common filter replacement cycle:
- PP cotton: 3-6 months (depends on water quality)
- Activated carbon: 6-12 months
- RO membrane: 2-3 years
- Post-carbon: 12 months
When to replace:
- Permeate flow drops significantly (>15% below initial)
- Salt rejection drops (below 95%)
- Permeate TDS rises
- Pressure differential increases (over 0.5 MPa)
We recommend checking quarterly and replacing as needed.