Leave the drain valve of the holding tank opened. 让贮槽的排水阀打开。
As soon as the level of the holding tank reaches the low level switch, the mixer and the lime milk circulation pumps will be interlocked. 当贮槽液面达到低位开关时，搅拌器和石灰乳循环泵将互锁。
Verify that a high level alarm is installed on the sludge tank. 确认污水舱安装有高位警报。
