Ensure your hot tub water's hardness stays at an optimal level. This solution assists with keeping it in the 150 ppm to 250 ppm range, which, down the road, minimizes surface staining and corrosion to the system's plumbing and heater.  Can be used for any hot tub make or model.  1 Quart Bottle 

 Jacuzzi® brand product for All Hot Tubs

Calcium Hardness Increaser