Puritan Filter - All Carbon [4x1]All Carbon Cartridges Rely On The PURITAN All Carbon Cartridge For The Clean Solvent Performance You Need. The PURITAN All Carbon Cartridge is the best of its kind; its unique outer shell is designed and built to assure the ideal solvent flow through its carbon chamber and has the largest dye adsorption capacity of any standard size all carbon cartridge. The unique balance of the finest materials and construction means the PURITAN All Carbon Cartridge