Dear Sir/Mardam I am Truong from Hoa Tien company Co., ltd in Vietnam, I obtained your company name and address from the internet. I am interested your Ferrous sulphate heptahydrate prodcut for waste water treatment. Please send me your product information and the price of it. I look forward to hearing from you soon, Thank you so much Thank best regards! Truong (Mr) Mobile/wechat: +84 903 463 017 Email:moitruongchemical@********