Filter material with uniform particles for deep filtration, and part of the influent water participates in backwashing, which saves the amount of backwash water and reduces the turbidity of the effluent. 

Features: constant water level filtration, low consumption of backwash water.

Application: pretreatment for membrane process.

The air flotation process is combined with the filtration process to simplify the process to remove algae and SS. 

Features: saving process units, low turbidity of effluent; 

Applications: low temperature and low turbidity water; pre-treatment for membrane etc.

Horizontal sump design to prevent the filter material from being washed away during backwashing, often used in conjunction with ozone oxidation.

Features:filter layer not easy blocked; strong adsorption capacity.

Application: quasi class IV discharge standard