颜色的变化表明需要更换滤盒。
A color change indicates that the cartridge needs to be replaced.
当滤盒处于正常操作 时，该浮标显示第一种颜色。
When the cartridge is operating properly, the float displays a first color.
本发明将一种指示滤盒缓慢排干的指示器置于滤盒顶部。
An indicator that the cartridge is draining slowly is placed on top of the cartridge.
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