Price unbeaten performance

I had previously, want of a better knowledge of Reingiertabs Cafezia used. The result was good, but cost 15 tablets. 8
Here I get a whole year's supply at a very fair price. Since then we have Puly Caff acquired, we do not clean our Siebtäger every 2 months with a bad conscience, but every 2 weeks; with good.

Because it is not necessarily immediately apparent, here's a hint: The bottle is about a 1l bottle (estimated, I have seen the product not in sight)