What indicator signifies that a water filter should be replaced?

A significant indicator that a water filter needs to be replaced is an increased pressure drop across the filter. As filters become clogged with contaminants and impurities from the water they are designed to purify, the resistance to water flow through the filter increases. This drop in pressure means the filter is becoming less effective at performing its job.

When the pressure drop across a filter exceeds the manufacturer's specifications, it often signals that the filter is saturated and needs to be replaced to ensure continued effective filtration. Changes in water flow, filter color, or unusual smells can provide additional insights into filter conditions, but the pressure drop is a more precise and critical measurement directly linked to the operational effectiveness of the filter.