Watts (MAXETW-FF975) C-MAX 10" x 4.5" Full Flow Coconut Carbon Block 5 Micron FilterWatts Premium Carbon Filtration C MAX MAXETW FF975 10" x 4. 5" Full Flow Coconut Carbon Block Filter Thick wall coconut shell carbon block engineered for superior VOC and chlorine reduction in whole house and well water applications. 5 micron filtration in a full flow design. NSF Standard 42 5 Micron 100% Coconut Shell WHY IT WORKS Thick wall carbon block outperforms standard GAC 100% Coconut Shell Carbon Water washed coconut shell carbon provides