On November 15th, Henan Kaijie Water Treatment Co., Ltd. provided a quotation for coal-grade powdered activated carbon at 3500 yuan per ton. The specifications of the coal-grade powdered activated carbon are: domestic, iodine value of 500, Henan Kaijie Water Treatment Co., Ltd., enterprise standard, 500, 6. The validity period of this quotation is 7 days. The provider of the quotation is Henan Kaijie Water Treatment Co., Ltd.