Filter cartridge and water purification system

A filter cartridge, comprising:

• a shell provided with an accommodating chamber and a water inlet, a pure water outlet, and a wastewater outlet communicated with the accommodating chamber;
• a filter body provided in the accommodating chamber, wherein the water inlet is communicated with the wastewater outlet through the filter body, a water storage space is provided between an outer peripheral wall of the filter body and an inner wall of the shell, and the water storage space is communicated with the pure water outlet;
• and
• a central tube provided in the filter body, wherein a sidewall of the central tube is provided with a central hole communicated with the filter body, and a through hole at a lower end of the central tube is communicated with the water storage space;
• an upper end cap assembly and a lower end cap assembly;
• and
• an outer skeleton tube provided between an outside of the filter body and the water storage space;
• wherein a baffle is provided in the central tube, the central tube is divided into a first chamber and a second chamber by the baffle, the first chamber is communicated with a through hole at an upper end of the central tube, the second chamber is communicated with a through hole at a lower end of the central tube, and the central hole is communicated with the second chamber;
• an upper end surface of the filter body is connected to the shell through the upper end cap assembly, a lower end surface of the filter body is connected to the shell through the lower end cap assembly, the upper end cap assembly and the lower end cap assembly are also respectively formed with a first positioning member and a second positioning member, the first positioning member and the second positioning member respectively extend into the first chamber and the second chamber, the second positioning member is formed with a communication hole, and the second chamber is communicated with the water storage space through the communication hole;
• and
• an upper end of the outer skeleton tube is hermetically connected to the upper end cap assembly, and a lower end of the outer skeleton tube is hermetically connected to the lower end cap assembly.