DIRECTIONS FOR USE:
1. Hardness level should be tested often and maintained in the range of 100 to 200 ppm.
2. If level is below 100 ppm, add 110 mL per 1,000 L of spa water to raise hardness by 50 ppm.
3. Pour directly into spa water while the spa is in operation.
4. Wait 15 minutes before using spa.