How to replace the water purifier cartridge

The best way to find a professional water purifier after-sales personnel, I have a relative of the new house kitchen installed a set of water purifier + dining room or living room drinking water installation and maintenance of the old water purifier, change the cartridge, as if in the new high-tech district of Xinyu City, Longtanzhou Road (the new People's Hospital and the water behind the Lanshan II) Xian RuLai drinking water service center