BestMax XXL High-Capacity Water Filtration Solution, designed for combi ovens, (1) cartridge, protection against limescale, chlorine, & off-flavors, High-Efficiency Technology (HET) ensures consistent water quality, extended equipment life, & optimized steam performance, the purchase of the FLEX 1 connection kit is MANDATORY for first time purchase, additional cartridges may be purchased without FLEX 1 connection kit as replacement filters (NET) NO DISCOUNTS APPLY