This is British Water Filters' fully compatible replacement for the Franke Triflow 'Hi-Flow' Carbon Block water filter cartridge. Designed with a high quality carbon block and pre-filter wrap, our Franke ‘Hi-Flow’ cartridge uses the same technique as the Franke product but with a value- for –money price tag! The Hi-Flow replacement water filter cartridge is particularly effective against chemicals and heavy metals, including chlorine and lead. This cartridge comes direct from our own, UK factory.