1. Maintain proper daily levels:
Alkalinity: 100-150 ppm
2. If pH levels are below 7.2-7.8, add 20 mL of SPA PLUS GEL per 1,000 L of spa water to increase pH by 0.4.
3. Spa must be in operation before SPA PLUS GEL.
4. Wait 15 minutes and retest pH.
5. Repeat operation until recommended levels are reached.