What does water pressure drop mean in practice?
After the filter, the cause may be a worn cartridge, too small a housing, a clogged valve or exceeding the design flow.
When does it matter?
Measuring only one side does not distinguish between a power problem and device losses.
Which solutions are related to it?
You need to measure the static and dynamic pressure before and after the filter, and then remove the narrowing or select a larger system.