Tubular filtration membrane made-up by ceramics, metal and other inorganic materials,  The flow passageway range 4~12 mm and even larger , large passageway is good for contamination protection, chemical washing, maintain and long service life.

Comparing with traditional film, tubular membrane has the following characteristics：
1. Symmetric membrane structure, thick membrane and well wear-resisting performance
2. Good stability under acid/alkali, 25% NaOH/H₂SO₄durable
3. Corrosion resistance, can be used to deal with HNO3 and HF mixed acid
4. High flow rate
5. Large membrane diameter, simple pretreatment, high concentrate rate
6. Thick membrane, long working life
7. Easy cleaning, back wash is available and strong acid/alkali available