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District heating is used to heat buildings primarily in conurbations or areas in which large quantities of waste heat are available. Hot water or steam are provided by the power utility and are emitted to the building system via a heat exchanger. If untreated fresh water is heated in the secondary circuit of the heat exchanger, this may result in substantial scaling up in the heat exchanger. The scale is deposited and acts as an insulator so that heat exchange is far less efficient. Merus reduces deposits in this heat exchanger, the efficiency increases and, in most cases, it is possible to dispense with costly servicing. In addition, corrosion is stopped, thus prolonging the service life of the heat exchanger.
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