The four capsules found mixed with water a cleaner set of 2L. If one adds to this by, the capsules are priced just above the concentrates in the drugstore.
As part of a test pack I have consumed two capsules and thus repeatedly cleaned my windows. It seems as if the dosing instructions failed to the detriment of the cleaning result. Slightly less cleaner and there are no streaks on the windows.
From the window cleaner you are in the water, I can only advise. This led to my discs basically Schlieren (before rant, I try something out). However, one can also use the Window Cleaner Pur, with the price, choose a brand-name product, into perspective compared to the capsules.
Whether you buy now finished window cleaner or use this product is up to you. Because I like the subtle smell, I continue to buy this product.
