APLOS Alpha: Replacement Reverse Osmosis Membrane Stage 4: High-quality RO membrane Effectively reduces: - Dissolved salts- Hardness- Heavy metals- Nitrates- Microplastics,- Bacteria,- Viruses and more. Replacement Filter Materials: - PP filter housing- PA Filter Replacement Steps: 1. Isolate power and shutoff unit.2. Shut off water supply to unit.3. Open tap and drain pure water and release pressure. Close tap.4. Easy pull and push filter replacement.Clicksound indicates that filter is installed properly.5. Reactivate water supply and power.6. Reset replaced filter lifespan.7. Check for any water leakage. Service Life:Recommended replacement periodevery 2-3 Years *(Please note this will vary according to water usage and feed quality)