This is a coconut shell,  activated carbon block cartridge that is rated at .5 microns nominal filtration (1 micron absolute). It improves the taste and odor by removing chlorine.  It meets the NSF/ANSI Component Standard 42 .  

We use this cartridge in our systems primarily for chlorine and parasite removal.

This is the replacement cartridge for the pre filter in the following models:

• Counter Top MB612 (10-CT-MB612),
• MB612 EB and FS styles,
• MB618 EB and FS styles
• MB618 PLUS EB style
• MB818 EB and FS styles