The Sutro is used to maintain your chemistry. We recommend balancing your pool before putting the Sutro in. These are the parameters for a well balanced pool:
| Free chlorine | 2-4 ppm |
| Total chlorine | 2-4 ppm |
| Combined chlorine | 0 ppm |
| pH | 7.2 - 7.8 |
| Alkalinity | 80-120 ppm |
| Calcium Hardness | 200-400 ppm |
| Stabilizer | 30-100 ppm |
| Copper | <1 ppm |
| Iron | <1 ppm |
| Phosphate | <100 ppb |