Because I need quite a lot of detergent and do not want to constantly buy more, I decided for the large package, as these also appeared on the least expensive to me. (Price when purchased 14.60) The detergent is doing what it should otherwise, the laundry is so clean when washing. Residues on the material I have not been able to find. I Dosière a Duo-Cap up to 6 kg normally soiled laundry. Which we here have very soft water and a fairly new washing machine. Whether other conditions, must be different doses, you can learn more about the hotline of the manufacturer or on its website. There I was also informed in advance, as I often have the impression to be used in a pre-defined detergent more as if I proportion it yourself. Here I feel it but the other way around and grade can imagine here, even something of detergent (and therefore money) to save. The handling is otherwise simple: A Duo-Cap for laundry in the machine - switch on - ready. :-) All in all, I am so far satisfied with the product.