Layered Carbon S Top. Carbon S/PFAS WAX SPE Cartridge, 50/200 mg, 6 mL (30 pk). EPA Method 1633 compliant. Carbon S on top configuration follows EPA 1633 sorbent order for solid samples (i.e. soil, sediment, biosolids, and fish and shelfish tissue). This product is only available to U.S. Domestic...