Hello Lokesh, If this is a ...

Hello Lokesh,

If this is a new problem, pl review what changes happened during this time.  It could be related to pre-treatment process like high turbidity, insufficient coagulant dose, poor flocculation and settling. Or filtration issues: did you put new sand media (size?), are all the filtration units working, are both air and water backwash rates sufficient?

I worked with Dr. Amirtharajah who was the international expert on filtration. In 1980s I lived in New Delhi and familiar with treatment plants there.  Hope we can help you.

Thanks,