The kit offers a better price than buying the products separately and ensures that you have complementary products already paired together, without any risk of incompatibility.

No, you can also use them for hand washing. Furthermore, if the washing machine is not full, you can use just half a sheet by easily breaking it in half with your hands.

To some extent, and it is important to be clear about the difference. What citric acid does for laundry: it sequesters the limescale in the wash water, neutralizes alkaline detergent residues, and reduces fabric stiffness caused by calcium deposits. In hard water (as in many areas of Italy, including the North), the effect is clearly noticeable: the laundry feels softer to the touch and less "cardboard-like". What citric acid does NOT do: it does not leave a lubricating film on the fibers (a typical function of traditional fabric softeners) and it does not scent the laundry. In short: if you find that your laundry feels stiff mainly due to limescale, citric acid can functionally replace fabric softener. If you are looking for the intense fragrance and "cottony" feel of traditional fabric softeners, citric acid will provide a different, more natural, less "cosmetic" effect on the laundry.