iSpring F3 3-pcs Replacement Filter Set for for Water Filters with standard 10-in housings (3pcs: Sediment， Granular Activated Carbon， CTO Carbon Block. NO membrane)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>The first three stages of residential RO systems are recommended to change every 6 to 9 months</li><li>Fits 10" standard filter housings， compatible to most RO systems， includes Watts Premier， Flowmatic， PuROLine， Crystal Quest， Apec， and etc.</li><li>For iSpring 5-stage， 6-stage &amp; 7 stages systems: RCC7， RCC7P， RCW5， RCC7AK， RCC7P-AK， RCC7U， RCC7AK-UV， RCC1UP， RCC1UP-AK and etc</li><li>Individually wrapped， fresh from factory</li><li>High-quality replacement water filters</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51Nr%2B3OX-2L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51w%2BE7QAbIL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/515Oci76JAL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51Guz7Q4-LL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/61y5zk2sdZL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/61aeRVo%2B5mL.jpg" noproxy>