APLOS Angel: Replacement 600GPD RO Membrane Replacement Membrane for the APLOS ANGEL Stage 4: High-quality RO membrane Effectively reduces dissolved salts, hardness, heavy metals, nitrates, microplastics, bacteria, viruses etc.The reverse osmosis membrane with a pore size of 0.0001 micron (0.1 nm), can significantly improve the quality of your tap water by effectively reducingbacteria, viruses, heavy metals, pesticide residue, lead, fluoride, and other harmful substances. Produced water is fresh, pure, and suitable for direct use Replacement Membrane Materials: - Reverse Osmosis Membrane- 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. "Click" sound 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: - 2