Aquasana AQ-RO3-RO Stage Two 2-Year RO Membrane Replacement Filter for AQ-RO-3<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>RO Membrane should be replaced every 1-3 years based on water quality and usage for optimal filter effectiveness</li><li>Other Reverse Osmosis systems typically reduce 5-15 contaminants. Aquasana reduces 74</li><li>Reverse Osmosis reduces 14 impurities including fluoride， nitrates， nitrites， lead， radium and arsenic</li><li>Selective Claryum Filtration reduces 60 contaminants including chlorine， chloramines， heavy metals， pesticides， and herbicides</li><li>Remineralization designed to provide healthy amounts of calcium， magnesium and potassium for optimally alkaline， pH balanced water</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31pAyEQVUhL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/617pOwMkeCL.jpg" noproxy>