On November 30, Henan Kaijie Water Treatment Co., Ltd.'s quotation for coal-based powder activated carbon is 4800 yuan/ton. The specifications of coal-based powder activated carbon are as follows: domestically produced, iodine value 700, Henan Kaijie Water Treatment Co., Ltd., enterprise standard 700 6. The validity period of this quotation is 7 days. The quoting party is Henan Kaijie Water Treatment Co., Ltd.