Includes 10kg BWT Salt Tablet Starter Bag This new release from BWT replaces the MC450 Water Softener. Comes complete with a Full Installation kit - Everything you need to install the unit no matter what system you have! Installation kit includes components you need to install on: - Conventional vented system - Combi Boiler - Unvented System - Pressurised System - Megaflow System ....a saving of up to 60! BWT WS455 Luxury Water Softener - Delivering Irresistibly soft silky luxury water Now Includes Free Commissioning What does the Free Commissioning Involve This new free service will see a commissioning engineer taking on the customer service element of the new installation. The engineer's visit can be booked with the BWT commissioning team by either the installer or the.