Plumbing – Kitchen Faucet Low Flow by design

Do you have a screen, in the tap (faucet) at the end where water comes out into the sink? (or the line that collects hard lime, water deposits?) This can be a problem anytime the water is hard, THUS quite mineralized. Those bits- often the size of sand grains -- can collect and wreak havoc. Clogging of water lines if galvanized via mineral build up before getting to the faucet in the supply lines can be an issue also. I have seen this in laundry lines where mixed water is a problem when washers do not rinse well - their lines are messed up with sand, pet hair and other clothing debris that does not rinse out of the filter properly and collects to clog everything up, one must check the washers as well as the mesh screens at ends of supply lines so all water goes where it should without a hitch - or leave linty residue on clothing because of the clogs involved.

This symptom is common with external sprayers. The diverter causes water to shutoff from the faucet when the sprayer is in use. The external sprayer may be leaking (into the sink, or under it) or the diverter valve itself may be failing. If you have a sprayer, check both ends of the hose for leaks and fix that if you find any. If not, remove the valve and make sure there's nothing that can be easily cleaned or a bad washer that can be replaced. As a last resort, take the valve to the store to find an exact replacement.