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To measure is to know
To know how much product to add to your water, you first have to measure. You can measure the water with watet testers.
pH, chlorine, alkalinity and hardness are the most important values to measure.
After the spa is filled with water:
1. Measure water using a water meter
2. Adjust pH to between 7.2 and 7.8.
3. Adjust chlorine level.
At new spa water changes, as well as before and after the use, measure and adjust to maintain good water quality.