As the most loved British Water Softener company, BWT and their ten years of constant research has led to the finest products in the category.Available for free next day delivery.The Waterside WS355 and WS355HF models These machines are fitted with the Millennium Rotary Valve.Options to chooseHigh flow model WS355HF with 22mm hosesStandard model WS355  with 15mm hoses Specification on all ...