Easy to Handle – Easy to Use – Dissolves Quickly – Bio-Pak Express is the result of Walex’s extensive research into discovering new, highly effective natural enzymes to control odour and liquefy waste. BIO-PAK EXPRESS starts working immediately to control odours and breakdown solids in the waste tank, including all types of paper. BIO-PAK EXPRESS is completely safe for the environment and septic tanks. No need for messy liquids or chalky tablets