Always use distilled/demineralised water, even if your machine is a modest little domestic one. Tap water will not only shorten the life of the machine (by more than half!), but the sediments and deposits left by tap water will contaminate the steam and the job you are cleaning.
I have had my current steam cleaner for close to ten years now. Only ever use distilled water. Tap water would have killed the machine in under one year.
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