Patent ID: 8015628

Claim:
A dispenser for dispensing a composition in response to level changes in a liquid in a tank, the dispenser comprising: a container for holding the composition; a discharge conduit in fluid communication with the container; an air inlet in fluid communication with the container; and a level sensing member mounted to the dispenser such that a lower end of the level sensing member cotacts the liquid in the tank and senses its level; whereby a rise of the liquid in the tank between a lower liquid level and a higher liquid level can cause the level sensing member to alter air pressure in a headspace of the container above the composition and thereby cause a controlled discharge of the composition from the discharge conduit; whereby a fall of the liquid in the tank between the higher liquid level and the lower liquid level causes the level sensing member to alter pressure in the headspace and thereby causing air to be vented into the headspace from the air inlet; and a compartment in fluid communication with the container and in fluid communication with the discharge conduit, the compartment configured to accumulate an amount of the composition before a portion of the amount of the composition is discharged from the discharge conduit; wherein: the compartment is in fluid communication with the container by way of a composition supply conduit having a lower orifice, the compartment includes an exit passageway having an upper inlet and a lower outlet, and the lower orifice of the composition supply conduit is positioned in the compartment below the upper inlet of the exit passageway of the compartment.