On November 4, Henan Kaijie Water Treatment Co., Ltd.'s quotation for coal-based powder activated carbon is 7200 yuan/ton. The specifications of the coal-based powder activated carbon include domestic products with an iodine value of 900 and a standard set by the company at 900 10. The validity period for this quotation is seven days. The provider of the quotation is Henan Kaijie Water Treatment Co., Ltd.