FreshWater Vanishing Act is an easy way to reduce calcium levels in your spa during your initial start-up and when you drain and refill your spa, or when calcium levels are unusually high. High calcium levels reduce the lifespan of your hot tub and sanitizing system.
For most hot tubs, you can simply place the Vanishing Act pillow in your spa and wait 24 hours for the calcium level to decrease. For larger hot tubs, we recommend the Vanishing Act XL pillow.