Filter Description 1st Stage: Polypropylene Sediment filter removal 5 micron 10" filter -removes dust, particles and rust. Protects and extends the life of the RO system. 2nd and 3rd Stage: 10" Activated Coconut Carbon block CTO filter - gets rid of unpleasant chlorine, tastes, odors, cloudiness and colors. Also removes VOCs and other common chemicals from the water. Our double carbon blocks are designed to achieve the maximum possible chlorine & chemicals removal in drinking water. Our carbon block filters have a larger surface area that maximizes contact time to water purity and extend the lifetime of the membrane. Compatible with Most Standard Sizes and Compatible with Most Systems APEC Water systems Ro-90,APEC Water Systems ROES-UV75, APEC Water Systems ROES-PH75，APEC Water Systems RO-PERM，APEC Water Systems ROES-50，APEC Water Systems WFS-1000，RO5DXG RO5DXG， iSpring RCC 1P， iSpring RCC 1UP， iSpring RCC 1UP - AK， iSpring RCC7， iSpring RCC7AK， iSpring RCC7AK-UV， iSpring RCC7D， iSpring RCC7D2， iSpring RCC7P， iSpring RCC7P -AK， iSpring RCC7U and other most of 10 Inch standard RO systems. This filter set includes: (x2) 5 Micron coconut shell carbon filter (x1) 5 Micron, 100% polypropylene sediment filter CARBON BLOCK FILTER IPW Industries Inc carbon blocks are manufactured with a high purity Coconut Shell Activated Carbon. Our acid washed carbon blocks activate the carbon to make it more porous and able to remove more contaminants than standard water washed carbon. With a high chlorine reduction, great dirt-holding capacity, and greatly reduced carbon fines, you will soon make our Carbon Blocks your preferred choice! SEDMENT FILTER Economical light weight filters for standard 10" housings. IPW Industries Inc sediment filter cartridge's coreless design is an economical solution to pre-filtration for many applications.