I have a 27,000 gallon vinyl pool that is getting a new liner due to hurricane damage. I have an SWG for the pool but don't know how to go about setting up the pool after the liner is replaced. Will I be able to use just the SWG or will I need chlorine as well to get started. I know that I will need to adjust alkalinity, hardness, and PH as part of the filling. I am just uncertain if I can use just the SWG to get the chlorine levels up.