To switch the cartridges, you can aquire a new one at a hardware store. Once you've eliminated the one, you can easily affect the new one. In the event the water leaks in the spout or is definitely dripping from underneath the counter, it is definitely best to call up a professional. In addition to repairing water leakages, you'll also need to be able to replace the O-rings. Make sure of which the new types are properly lined with heatproof plumber's grease.