The BLS does not have a separate category for assistant principals. According to Salary.com, as of March 2015, assistant principals in the 25th-75th percentile earned $69,591-$93,291 per year, with a median of $79,831.n order to become an assistant principal, your surest path is to accumulate teaching experience and then earn a master's degree in education leadership or education administration.
The last cause of green water in pool water is metals, usually copper, that have oxidized. Metals can be introduced through source water, from some cheap algaecides, or, if the water is acidic, from the metal components of the pool, most commonly from copper heater elements.
Take steps to treat the problem before it makes the pool unusable. There are varieties of algae that can grow in swimming pool water. Green Algae: The most common type of algae and also the easiest to prevent or eliminate. Green algae are free-floating or surface-clinging and can turn a pool green in a matter of hours. Black Algae: A filamentous growth on the rough surfaces of the pool.