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.
Adding chlorine tablets (sanitizer) should alleviate this. If the pH remains high then add pH decreaser or pH down and follow the instruction on how to apply. If the pH is low and the chlorine is 3.0 ppm and the water remains green, then this could be an indication that your water has a high copper level. Have your water tested at the pool supply store.