Everpure water filter cartridge. Large capacity filter for multiple branches and commercial use. The filter material is made of block carbon and compresses fine activated carbon to form a donut shaped block (spool type) and removes impurities larger than 5 to 20 microns and produces fine water. In addition, when used with coffee machines or steamers it has the effect of preventing scale (calcium) deposit. Requires QL2 and QL3 heads sold separately. Japanese instruction manual included.