The Zipcode for Poland is. Poland is a village of Mahoning, Ohio in the Great Lakes region of the USA. It is located about 141 miles east-northeast of OH's capital city of Columbus.In the most recent US census the population of Poland was 2548. City/Zip code State.oland is a village of Mahoning, Ohio in the Great Lakes region of the USA. It is located about 141 miles east-northeast of OH's capital city of Columbus. In the most recent US census the population of Poland was 2548.
pH. The pH is a measure of the acidity of the water. The pH scale goes from 0 to 14, where pH 7 is neutral. If the pH is above 7, the water is basic; if it is below 7 the water is acid. The optimum pH for pool water is 7.4, since this is the same as the pH in human eyes and mucous membranes. A pH of 7.4 also gives good chlorine disinfection.
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.