"The water is hard water so you need to put baking soda in the washing machine when you use it."
"The water is hard water so you need to put baking soda in the washing machine when you use it." "The water is hard water so ~" 「その水は硬水なので〜」 "you need to put 〇〇 in ~" 「〜に〇〇を入れないといけない」 "baking soda" 「炭酸ソーダ」 "the washing machine" 「洗濯機」 "when you use it" 「使うときに」