To keep a pool clean and safe, you need to pay close attention to the chemistry of the water. Some substances, like muriatic acid, are used to lower the pH, which affects any other chemical balance. PH is a measurement of the hydrogen ion concentration. The scale ranges from 0 (very acidic) to 14 (very base), in which 7 is neutral pH. The optimal range for pools should be between 7.4 and 7.6.
Also if the alkalinity levels in your pool are constantly spoiling the balance of the chemicals in your pool, it may be time to turn to muriatic acid to reduce the alkalinity of your pool once and for all.
Take a sample of your pool water in a bottle and take it to a pool accessories store to have the chemical balance of the water tested. Your computer will break down all the components of the water sample, and they will print the list for you to see. For those who prefer to do it on their own, there are kits so that they can do it at home.
Turn on your pool filter. Fill a bucket of pool water halfway and add muriatic acid in the ratio of 10 to 1 or 20 to 1. Therefore MURIATIC ACID must be applied in a proportion of 1 Lt. every 20,000 Lts. of water contained in the pool. After 1 hour, check again. The color will be more subdued, that is, the pH level will be more neutral. Be very careful; Muriatic acid can burn your skin, clothing, and just about any surface it touches.
Walk around the pool and slowly pour in the acid and water solution. Leave the filter on. The acid will neutralize in approximately 30 minutes. This procedure should be done early in the morning.
Slowly pour the acid into the deep end. Don’t add too much at a time. Let the filter run for four hours and then retest before adding more chemicals.