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Dear PL389705,
Regarding the inquiry about refilling the X40 Ultra Complete Cleaning Solution, the robot is designed to automatically adjust the cleaning liquid ratio based on the level of dirt. It is possible for it to be used over a long period without issue, so please do not worry.
Additionally, please check if the cleaning solution has decreased and ensure that the roller brush is clean and free of any unpleasant odors after each cleaning.
If you need further assistance, please provide your service ticket number or contact us via me > Help & Feedback > Contact us > Online Customer Service. | 
