Liquid level controlling apparatus

A liquid level controlling apparatus comprising:

• a plurality of main sinks, a first main sink of the plurality of main sinks comprising a transmission port and a first liquid level detector, the transmission port being disposed on a bottom portion of the first main sink, and the first liquid level detector being disposed on a top portion of the first main sink;
• a storage sink comprising a delivery port and a second liquid level detector, wherein the second liquid level detector comprises a first liquid level gauge and a second liquid level gauge respectively disposed on a high position and a low position inside the storage sink, and adapted to detect a liquid level upper limit and a liquid level lower limit of the storage sink;
• a pump comprising an outlet and an inlet;
• and
• a connection tube disposed between the first main sink and the storage sink, the connection tube comprising:
• a rehydration tube comprising a first rehydration section and a second rehydration section, two ends of the first rehydration section being respectively connected to the delivery port and the inlet, two ends of the second rehydration section being respectively connected to the outlet and the transmission port;
• and
• a drain tube comprising a first drain section and a second drain section, two ends of the first drain section being respectively connected to the transmission port and the inlet, two ends of the second drain section being respectively connected to the outlet and the delivery port.