Overpriced to topic

There are 2 sets each with a filter and nozzle cleaner bottle offered (1 liter) to EUR 58, ie we pay per set EUR 28, -

If you go to Amazon seeks carbon filter here you will find always also models under 10 EUR. The average is, but rather to the 10-12 Coal Filter diameter 10 to 15cm (thus roughly comparable to the carbon filter for the Geberit WC). A vacuum cleaner filter (not technologically comparable with carbon filters, but it is also about a household item that should be replaced annually) comes to 10 to 20 EUR, depending on whether you choose branded goods or Noname.

It therefore appears that about 15-20 EUR for the cleaning solution, makes about 1-1.5 EUR per month. I do not know how hard other brush her apartment, but I buy safely every 1-2 months a brand-purpose cleaner by almost EUR 5-6 ...

Bottom line:
The supplies could be a track be cheaper (no question), but one can not speak of usury really. After all, cost the toilet on the other side of EUR 3000 (depending on the retailer) plus installation and electricity. Fallen here for 2 EUR a month actually on and then you should rather not do without such a toilet and inexpensive to Bath shower off after the business (or with common water hose as in Scandinavia and Turkey)?