Easily dissolves and quickly increases calcium in spa water. Increasing the hardness of your spa water helps prevent etching, pitting and corrosion of spa surfaces and metallic components. Increases water hardness in one easy dose, helping enhance the life of your spa’s surfaces and equipment.

Directions for use: 

1. Add 20g/1000L to raise the hardness 15g/L
2. Mix (1kg max)  in a bucket of water before dispersing over the spa’s surface
3. Run the spa filter for 4 – 5 hours before resetting