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    Legionella test kits, descaling and disinfecting for showers

    For many buildings, showers pose the highest legionella risk within the property since they are susceptible to bacterial colonisation, scale formation and most importantly they produce an aerosol.

    Table 2.1: Checklist for hot and cold water systems

    Showers and spray taps

    Dismantle, clean and descale removable parts, heads, inserts and hoses where fitted.
    Consideration should be given to removing infrequently used showers, taps and any associated equipment that uses water. If removed, any redundant supply pipework should be cut back as far as possible to a common supply

    -Para 2.167

    In circumstances where there has been a lapse in the flushing regime, the stagnant and potentially contaminated water from within the shower or tap and associated dead leg should be purged to drain without discharge of aerosols before the appliance is used.

    What does this mean?

    Where possible, remove rarely used showers and taps, otherwise they must be flushed at least weekly and cleaned/descaled every 3 months.

    Showerhead plus

    This is a widely used product which descales and disinfects at the same time.

    Testing Showers for legionella bacteria

    Since showers are generally a higher risk, they are often tested separately from the remainder of the hot water taps. A water sample from a shower undergoes the same laboratory analysis as other samples but we give it a separate product code so that the correct instructions are sent out with the test kit.

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