The pH of water determines the solubility (amount that can be dissolved in the water) and biological availability (amount that can be utilized by aquatic life) of chemical constituents such as nutrients (phosphorus, nitrogen, and carbon) and heavy metals (lead, copper, cadmium, etc.).
No clue as to find out how many professional players are in those countries. Baseball in the US This information is for the US only: For Major League Players - There are 30 Major League teams each with a 40 man roster. 30 x 40 = 1200 Then, on average, each team has 6 farm teams in its system with a roster of 25 to 30 players. So 6 x 30 x 30 = 5400.
The number of balls used is 46. Factoring this number out to each team in the league playing 165 games and dividing by 2 since two teams play each other each game, the number of baseballs used during a typical MLB season would about 113,850 balls per year.