Please check stepwise  ...

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Please check stepwise 

Inlet water characteristic changed from the designed one?

System feed pumps are adequately designed or changed recently from previously installed or their VFD are not working 

Air release valve on Sand filters are working?

How old is the Sand media and what are the layers you have placed I.e. at least 4 layers of media are there properly 

Check the strainers are not loosen due to pressure built up and if these are tightened properly or not.

If media filter vessels are sized properly according to flow rate?

I think one by one you need to look into this aspect and solve the problem. 

 

Also check if the feed water quakltiy is worsen then you may need any coagulation flocculation pipe Flocculator sedimentation prior to sand filters.... 

Do not jump to simply change this to Carbon Filter.  

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Great suggestion! The plant was designed in 1992 and sand media hasn't been changed since then. 6 Layers of media with gravels and different grading sand is used. Flocculator is also being used prior to sand filters and we are using Alum. But i  will also try and check the other things you suggested. Thanks

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