A bulk storage tank holds the primary chemical supply for an injection system, typically sized to cover days or weeks of dosing rather than the shorter refill cycle a day tank is built around, reducing how often a facility needs to schedule chemical deliveries and refills. Material selection is the critical decision on any bulk tank, since the tank sits in continuous contact with concentrated chemical for extended periods, and the wrong material choice leads to slow degradation that often goes unnoticed until a leak or structural failure occurs. Tanks are typically fitted with level indication, overfill protection, and secondary containment provisions, since a bulk tank failure represents a much larger volume release than a day tank would produce.