What is the maximum allowable flow for backwash?

What is the % flux decline per year assumed while designing the reverse osmosis system for treating RO permeate water?

What is the minimum required redox potential of water?

For which of the following activated carbon is not used?

While designing the demineralisation plant what is considered as the weak basic anion load?

What is the retention time considered for the aerobic zone for the AO process for removing phosphorus?

What is the limit of total dissolved solids in treated water which is to be used for the gardening purpose?

Which of these are not removed by an activated carbon filter?