On October 27, Henan Kaijie Water Treatment Co., Ltd. provided the following quotation for coal-grade powder activated carbon: 4300 yuan/ton. The specifications of the coal-grade powder activated carbon are as follows: domestic production, iodine value of 600, Henan Kaijie Water Treatment Co., Ltd., enterprise standard, 600 6. This quotation is valid for 7 days. The quote is provided by Henan Kaijie Water Treatment Co., Ltd.