Pre-measured for convenience, each 1.5 L/50.7 fl oz pump bottle contains 300 servings – one pump dispenses one serving. This means no mess, easy-to-clean, and reduced waste.Its unique pump system locks on once installed, making it impossible to remove and entirely tamper proof. Just be sure to release the pump neck before first use, by turning the pump neck left while firmly holding the base until the neck pops up.