Replaces original SER-3018: Only 20 instead of previously 25 applications

I had this 5-pack already moved last year because we wanted to have the right descaling product for our then new coffee machine. It fulfilled its purpose fully and we were with the price, compared to single purchase, satisfied.
I have searched this time by the same item number for the package (5x500 ml), for approximately the same price. But I realized only after receipt that the agent has now been revised "ecological" and only 4 applications per bottle permitted. So I instead of 25 only 20 applications to use as a by approx. 25% more expensive product.
One application we have already carried out at the coffee machine. There seems to be qualitatively no difference.
Whether we are looking for the next time an alternative is still open.