To maintain your swimming pool’s water level, keep it about halfway up the skimmer opening. This level is crucial for proper skimmer and pump function, preventing damage and ensuring efficient circulation. Regularly check the level, as it can drop due to evaporation or rise with rain, and use a garden hose to add water if it’s too low, or a pump to remove excess if it’s too high. After adjusting the level, re-test and balance your pool chemicals.