Unlike the competitors, Phresh Carbon Filter V2 only uses the premium 20% of any carbon source. Their in-house carbon grading lab allows them to independently batch test, de-dust and hand pick their carbon. They use the exact particle size required for the best airflow (pro-grade 4/8). Any carbon that does not meet their stringent air stream testing is rejected. The result is the thinnest, lightest, and least restrictive carbon filter canister available. The advantages are more airflow and better odor filtration with a longer expected operating life span. The Phresh Carbon Filter V2 improvements include new high-strength D shackle mounting points for ease of installation and thicker boxes for more reliable shipping and handling. That’s the Phresh difference!