The chemical storage tank, commonly referred to as the bulk storage module acts like an expansion pack for its partner – the Blend Module. The chemical storage tank allows you to hold an additional 50 gallons of bleach, for a total carrying capacity of 100 gallons when paired with the Blend Module. This allows you to have more bleach on hand for larger residential jobs or commercial work. This keeps you below the 119 Gallon DOT Limit for driving with bleach containers.