The DEMO version only includes 4 pages:
http://wasser-filter.org
http://wasser-filter.org/wasser_enthaerten.html
http://wasser-filter.org/wasser_entkalken.html
http://wasser-filter.org/umkehrosmoseanlage.html

It is possible to download these free files and install them on your server, so you can test how the site works.
Visit https://www.waybackmachinedownloader.com/en/buy-wayback-machine-downloader-recover/ to buy a fully functioning site.
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