* Trả lời các câu hỏi: - Nguyên liệu lọc có khó sử dụng không? - Nguyên liệu lọc nước đó xử lý nước như thế nào ? - Chi phí để sử dụng nguyên liệu lọc nước? - Có những vấn đề nảy sinh gì không trong quá trình sử dụng?
* Answer the question: -Filter materials are hard to use? -Water purification materials which waste water? -Cost to use raw water filter? -There are no problems arise during use?
* Answer the questions: - Raw Filter difficult to use? - Raw water treatment water filter that like? - The cost to use water purification materials? - There are problems that arise in the course of what use?
* answer questions:Is it difficult to use the filter material?- what is the water in the water treatment filter material?Cost use filter material.Are there any problems arising in the process used?