Thanks to all the experts ...
Published by ADEKUNLE BROWN, CHEMIST/WATER PLANT OPERATOR at OMOTOSHO ELECTRIC ENERGY POWER PLANT(shift head)
Thanks to all the experts that contributed to this post.
Currently have been able to get the coagulation right by varying the dosing rate and the purifier inlet flow.
About jar test the company I work for have no provision for jar test. However, over the years have been able to master the characteristic of my raw water across the seasons.
The current problem may be as a result of pipeline work upstream.
Thanks.