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).
It's a double birthday! J.K. Rowling was born July 31, 1965, in Bristol, England. From the stories that Rowling tells about her composition of the Harry Potter book series, Harry was born on a train one day when she imagined the story. Harry's official birthday as recorded in the novels, however, is July 31.