Why is monitoring head loss across a filter important?

• A. It indicates media clogging and the need for backwashing to restore filtration efficiency.
• B. It signals the filter is new.
• C. It shows water taste quality.
• D. It determines chemical dosing rates.

Answer: (A)

Monitoring head loss across a filter is about tracking the pressure drop that occurs as solids build up in the filter media. As particulates accumulate, the pores get blocked, the flow path narrows, and more energy is needed to push water through. That rise in head loss tells you when the filter is starting to clog and filtration efficiency will drop if you don’t act. When the head loss reaches its set threshold, backwashing is needed to remove the accumulated solids and restore the media’s flow paths, keeping turbidity removal effective.

This isn’t a direct indicator that a filter is new, which would typically show a low head loss. It also doesn’t measure taste quality, since taste is about dissolved compounds and other factors, not pressure drop. And it doesn’t determine chemical dosing rates, which are based on treatment goals and required removal, not the pressure loss across the filter.