On December 1, Henan Kaijie Water Treatment Co., Ltd.'s quotation for coal-based powder activated carbon is $7,200 per ton. The specifications of the coal-based powder activated carbon are as follows: domestically produced with an iodine value of 900 and a company standard of 900, 10. The validity period of this quotation is 7 days. The provider of the quotation is Henan Kaijie Water Treatment Co., Ltd.