I think it's a backwash ...
Published by Eneko Suaga Baeza, Técnico de tratamiento de aguas y Puesta en Marcha
I think it's a backwash problem. Did your backwash steps include air+water? Or only air and then water?
2 Comments
Air followed by water
Published by Ashish Yadav, Assistant Director at Ministry of Defence, India
Please let me know difference in effects of both .
Published by ABHAYANKER BANERJEE