This filter is suitable for use in the Stainless Steel Coldstream undercounter and countertop systems (CA564 and CA566) and may also suitable for your existing 2″ candle water filtration system. It will not fit the blue undercounter system. Capacity 3,000L the Coldstream Max ceramic water purifier provides the ultimate in protection against water pollutants, waterborne viruses and delivers great tasting water too – it is made up of three key components. The carbon inner core protects against chemical contamination, including pesticides and herbicides. Surrounding this is our unique ceramic outer layer giving maximum anti-bacterial protection and the removal of particles, microplastics and PFAS. Finally, we add a duck egg blue ceramic outer layer containing antimicrobial properties, which helps to eradicate any waterborne viruses, providing maximum protection against all water pollutants.