Wait what I save

With us the price of water is increased and now I have this vebraut showerhead since early October.
Attachment and Handhaung easy.
The pressure is obviously not as strong as with a "normal" head but also wants to save what.
'M Curious how much we'll get to save.

Update 07:03:15
Have ca.2m³ less consumption, but also in the kitchen & bathroom Sparamaturen retrofitted, so only showerhead 2m³ no: Overall, however, this has paid off. 2+