After initially filling your spa with water, use some hot tub test strips to measure the hardness level of your water. If the reading is in excess of 100ppm, then you need to use a Vanishing Act calcium removal bag to help soften it.
Give the Vanishing Act bag a good rinse through until the water runs through it nice and clear.
Follow instructions on the box for help with the correct positioning of the calcium remover bag, which will differ depending on your spa model.
We strongly urge you, when using a Vanishing Act Calcium Remover bag, to give it a thorough rinse through prior to placing it into the hot tub. It is advised that the bag is left in the hot tub for 24 hours, ensuring you give it a turn it after 12 hours. You may find that in areas of particularly hard water, it may take more then one Vanishing Act bag to remove all of the Calcium from larger hot tubs.