... pollution.DS Series80% of the molecular sieve, 20% activated alumina;This type of drying filter core for added active ... of molecular sieve, 20% activated alumina, 5% carbon.This type of drying-filter core added activated alumina, activated carbon for adsorption acid of burn ... HW Series95% of molecular sieve,5% carbon.This type of drier core added the activated carbon, it suitable for Burn-off system ...