Accessory used for washing machine

A washer accessory used for a washer of a top loading type including a cabinet, a drum rotatably installed within the cabinet, the drum having an open top side to receive a treatment target therein, and a laundry entrance provided to a top side of the cabinet, the washer accessory comprising:

• a body forming an exterior by having a sealed internal space;
• at least one ultrasonic generator provided inside the body;
• a turbidity sensor configured to sense a turbidity of a washing or rinsing water received within the drum;
• a third communication module configured to communicate with at least one of a first communication module provided to the washer or a second communication module provided to an external terminal;
• and
• a control unit configured to control the at least one ultrasonic generator,
• wherein the body is formed in a manner that a weight center of the body is located at a lower side,
• wherein the at least one ultrasonic generator is provided to a lower part within the body, and
• wherein data sensed by the turbidity sensor is transmitted to at least one of the first communication module or the second communication module through the third communication module.