Whirlpool WDC 1070SL Service Manual page 13

3.8 Energy-Saving Water Tank
When EQ drainage tank has been a full tank of water cannot be discharged, until the drainage pump stops working
when there's water will reflux
To the pump and the pump barrel tube
These water-saving ball float will seal the barrel and pump barrel tube, is to avoid losses during washing detergent
and water savings.
Fault: The tank welded seal is not good, resulting in leakage; then the tank fixed bad, easy to loose.