Monarch Midi HE FreeFlow Water Softener - The next generation water softener with FreeFlow Valve and Opti-Brining technology making the Monarch HE ultimate range one of the most efficient water softeners on the market This Monarch Midi HE is supplied with a standard installation kit - suitable for traditional, (vented), plumbing systems with a storage tank, fitted to a 15mm mains supply: The standard gravity fed Monarch installation kit includes the following 1 x Pair 3/4", inlet/outlet, standard white, 600mm long hoses. 1 x Rapid fit hi-flow bypass for easy installation In addition to the installation kit and flexible hoses every Monarch Midi water softener includes a complimentary water test kit. Midi HE is suitable for 1 - 5 People, this is stated on an average water use of.