We'd like to inform you of our customer service and A/S schedule during the Chuseok holiday. Phone consultation and on-site A/S will be paused during the holiday period (October 4–9, 2025) and resume normally from Friday, October 10. For urgent matters, please submit a 1:1 inquiry on our website or email us at contact@kumkangbio.com, and we'll process requests in order after the holiday. We recommend securing sufficient microbial-agent stock and confirming normal operation before the holiday. We apologize for any inconvenience and wish you a happy holiday.