The Hydroflow HS38 is the domestic model for the average two to four-bedroom sized home. Fitting one HS38 protects the boiler, pipes, pumps, and appliances from limescale build-up and removes the existing limescale too. The HS38 fits around the pipe, is suitable for all types of pipe material, and works independent of flow rate. This model also protects light commercial appliances like solar hot water panels, ice making machines, and tea urns.