A liquid consuming system, comprising: an installation case configured to receive a cartridge, the cartridge comprising a first liquid chamber storing a liquid; a tank comprising a second liquid chamber; a flow path configured to communicate with the second liquid chamber and the first liquid chamber of the cartridge installed in the installation case; a head communicated with the second liquid chamber; a liquid level sensor; a first communication interface; and a controller system (130+45) configured to: in a case a position of a liquid level in the second liquid chamber is equal to or higher than a predetermined position, receive, from the liquid level sensor, a first signal; in a case the position of the liquid level in the second liquid chamber is lower than the predetermined position, receive, from the liquid level sensor, a second signal; and characterized in that the controller is further configured to: based on receiving the second signal from the liquid level sensor after receiving the first signal (L -> H), transmit first information indicating an order instruction of the cartridge through the first communication interface and after receiving the second signal from the liquid level sensor, receive a discharge instruction to discharge a liquid through the head; based on receiving the discharge instruction, discharge the liquid through the head; based on receiving the discharge instruction, count a discharge amount of the liquid instructed by the discharge instruction; determine whether the counted discharge amount of liquid reaches a predetermined discharge amount; and based on determining that the counted discharge amount of liquid reaches the predetermined discharge amount (S64:Y), transmit the first information through the first communication interface. an installation case configured to receive a cartridge, the cartridge comprising a first liquid chamber storing a liquid; a tank comprising a second liquid chamber; a flow path configured to communicate with the second liquid chamber and the first liquid chamber of the cartridge installed in the installation case; a head communicated with the second liquid chamber; a liquid level sensor; a first communication interface; and a controller system (130+45) configured to: in a case a position of a liquid level in the second liquid chamber is equal to or higher than a predetermined position, receive, from the liquid level sensor, a first signal; in a case the position of the liquid level in the second liquid chamber is lower than the predetermined position, receive, from the liquid level sensor, a second signal; and characterized in that the controller is further configured to: based on receiving the second signal from the liquid level sensor after receiving the first signal (L -> H), transmit first information indicating an order instruction of the cartridge through the first communication interface and after receiving the second signal from the liquid level sensor, receive a discharge instruction to discharge a liquid through the head; based on receiving the discharge instruction, discharge the liquid through the head; based on receiving the discharge instruction, count a discharge amount of the liquid instructed by the discharge instruction; determine whether the counted discharge amount of liquid reaches a predetermined discharge amount; and based on determining that the counted discharge amount of liquid reaches the predetermined discharge amount (S64:Y), transmit the first information through the first communication interface. based on receiving the second signal from the liquid level sensor after receiving the first signal (L -> H), transmit first information indicating an order instruction of the cartridge through the first communication interface and after receiving the second signal from the liquid level sensor, receive a discharge instruction to discharge a liquid through the head; based on receiving the discharge instruction, discharge the liquid through the head; based on receiving the discharge instruction, count a discharge amount of the liquid instructed by the discharge instruction; determine whether the counted discharge amount of liquid reaches a predetermined discharge amount; and based on determining that the counted discharge amount of liquid reaches the predetermined discharge amount (S64:Y), transmit the first information through the first communication interface.