Common organic causes include scale, algae, âpink slime,â white water mold and vinyl liner mold. The Langelier Saturation Index measures the corrosiveness and neutrality, or scaling ability, of water. Water, by nature, âwantsâ to be neutral or balanced.
Joanna J. K. Rowling is 51 years old (birthdate: July 31, 1965). Joanna J. K. Rowling is 51 years old (birthdate: July 31, 1965).
J. K. Rowling. 1965â, writer. Joanne Kathleen Rowling, author of the best-selling Harry Potter series of books, was born in Chipping Sodbury, near Bristol, in southwest England. Her birthday, as all true Harry Potter fans know, is July 31, the same as her famous boy-wizard hero.