Hard water causes decreased efficiency of laundering products and requires its higher use. Soap-based products cause creating of incrustations. Use of water softener (20 - 60 g) is advised in such case. If you are not sure about the hardness of your water, consult your water supply company or use a test stripe.
Hard water :
Use with laundry gel 40g / 2 spoons /
Use with laundry powder 50g / 2.5 spoons
Use with soap flakes or soap nuts 60g / 3 spoons