If a kitchen faucet has weak flow, first compare hot versus cold and this faucet versus other fixtures. Those comparisons help separate a local aerator or spray-head problem from a supply issue. They do not establish a pressure reading or prove that the cartridge needs replacement.

Use this comparison before taking anything apart

Observation What to investigate first
Both temperatures weak here; nearby fixtures normal Accessible aerator or spray-head maintenance for this model
Only hot or only cold weak That supply side, shutoff position or internal faucet path
Several fixtures changed together Household supply or pressure issue rather than one aerator
Flow changed after plumbing work Debris or a disturbed supply setting; tell the installer

Moen’s low-flow guidance begins with the supply shutoffs and distinguishes spout-aerator issues from other causes. Inspect accessible hoses for an obvious kink and note shutoff positions, but do not force a stiff or corroded valve. Stop for leaking connections.

Identify the aerator before removing it

Aerators are not all the same. Some are exposed, some need a recessed key, and some faucet outlets are not intended to be serviced in the same way. Find the faucet model and its instructions before using pliers or trying to unscrew a finished surface.

For a removable aerator, follow the approved removal and cleaning procedure. Protect the drain so small washers and screens cannot fall through, and preserve their order. Use the cleaning method allowed for that finish and part; a universal vinegar soak can be inappropriate for some materials.

Refit the correct parts and compare flow under the same conditions. Do not drill out a flow regulator or leave required parts out to make the stream seem stronger.

When cleaning does not solve it

Record whether the change affected both temperatures, whether a pull-down hose or spray mode behaves differently, and whether other outlets remain normal. Use those results for model-specific support or a plumber rather than buying an arbitrary cartridge.

A sudden household-wide loss of flow, visible leak or recurring debris needs assessment beyond this faucet. If the shutoff itself is the problem, read stuck shutoff-valve precautions before attempting to move it.

If flow or pressure problems affect several fixtures, use the household pressure-regulator checks before replacing a faucet part.

Sources

Moen: kitchen faucet low flow and aerator identification and cleaning , checked September 19, 2026. The comparison above is a way to organize symptoms; exact disassembly and replacement parts depend on the faucet.