The acid level in your pool is the most critical water balance chemical you will need. If your PH is off nothing really works the way it should. It is important to make sure that you check your PH levels weekly & for most daily if the pool is being used frequently or sits in the sun all day. Your PH should always be between a 7.2-7.6 range.
Depending on the size purchased the container may look different then what is shown.