On November 18, Henan Kaijie Water Treatment Co., Ltd.'s quotation for coal-based powdered activated carbon is 5500 yuan/ton. The specifications of the coal-based powdered activated carbon are: domestic, iodine value 800, Henan Kaijie Water Treatment Co., Ltd., enterprise standard, 800, 8. The validity period of this quotation is 7 days. The quoting party is Henan Kaijie Water Treatment Co., Ltd.