Thank you all. I produced ...

Thank you all.

I produced solution. There is no any flow (flux) through the tank, completely blocked. I used hydroxide peroxide and citric acid to decrease pH from 9,2 to 3. I applied a technique for recirculating water. Before applying backwash+regeneration, We done a pipeline modification for giving compressed industrial air for open nozzle. Finally we applied 3 times heavy duty bachwash. The service flowrate reached the design value and completely unblocked situation is running.. This application took 7 hours .  Thank you colleagues.