Coldstream Ceramic Water Filter FTO Plus x 4 – Suitable for Stainless Steel Gravity Systems This filter (4 pack) is suitable for use in the Coldstream Gravity System and is compatible with British Berkefeld and Berkey housings. It will not be suitable for mains water pressure systems. The Coldstream FTO Plus ceramic water filter is made up of two key components. Our specially formulated and unique ceramic outer layer, which gives maximum protection against bacteria and removes all particles and microplastics. Inside consists of our black granulated carbon media. This filter protects against fluoride, heavy metals, chemicals and more. Install a FTO Plus filter in your Coldstream Gravity system and you’re guaranteed safe, healthy drinking water with a great taste. Ideal for use in the home, off-grid units and also used in the field and by international relief organisations.