If my chlorine, alkalinity, and pH is low, what do i need to add?

Question:

If my chlorine, alkalinity, and pH is low, what do i need to add?

Answer:

To adjust the chlorine up, you will need to add chlorine - typically tablets, granular chlorine or liquid chlorine. Then you will add a pH adjustment chemical to bring the pH and alkalinity up. The active ingredient will likely be sodium carbonate or soda ash.