Aquasana AQ-RO3-R Stage 1 and 3 6-Month Replacement Filters for AQ-RO-3<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Carbon &amp; Claryum filters (stage 1 &amp; 3) should be replaced every 6 months or 365 gallons 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><li>Carbon &amp; Claryum filters (stage 1 &amp; 3) should be replaced every 6 months or 365 gallons for optimal filter effectiveness</li><li>Full system NSF Certification， not just select components like tubing or tanks. Aquasana proudly displays the NSF logo for standards 42， 53， and 58</li></ul></div><img src="http://ecx.images-amazon.com/images/I/415I93JwEiL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/617pOwMkeCL.jpg" noproxy>