Consider the duration of the injury. There are two types of back pain: acute and chronic. Acute is a type of injury that is there for a few days and then goes away, best described as coming and going.. Symptoms are often reasonably intense and heal in around four to six weeks.
Pure water usually has a pH around 7. Lemon juice is acid: dissolved baking soda is alkaline. (Properly speaking, dry materials don't have a pH.) Balance chemicals help you to avoid damage to your pool, either in the form of corrosion or scale deposits. Actually, it's a bit more specific than that: balance chemicals allow you avoid problems that result from having too much or too little limestone in the water (calcium carbonate).
Another cause of high pH is the use of pool chemicals in incorrect amounts. Chemicals like sodium carbonate, used to raise pH when the pool is overly acidic, can be overused, causing a high pH. Calcium hypochlorite, an alkaline substance used to add more chlorine to the pool, also can cause a high pH. When a pool has high pH, it can be lowered through the addition of chemicals like muriatic acid or sodium bisulphate.