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.
Improper pH Balance. Chlorine is a chemical added to swimming pools to kill bacteria that can build up over time and lead to a discoloration of the water. Green water is most often a sign of algae, not necessarily bacteria, but different pools have different bacteria that can affect the water.