You can solve many issues with faucets, often in a cost effective manner, by replacing individual parts. If you have a leaking faucet, then you may have worn out internal parts. In this case, you don't have to replace the faucet but that part. If you have irregular water flow, there might be a problem with the aerator or the cartridge. Just replace it. Low water pressure in the kitchen sink can also indicate a problem with the aerator or cartridge.