What does faucet-mounted water filter mean in practice?
It usually combines activated carbon with mechanical filtration, while a diverter sends ordinary washing water around the cartridge.
When does it matter?
The small cartridge has limited capacity and may reduce flow; not every model removes hardness or microorganisms.
Which solutions are related to it?
Match the filter to the faucet thread and verified claims, then replace the cartridge by time, volume or flow deterioration.