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.
There are three causes of green pool water. The first is a lack of chlorine. Without chlorine the pool water will quickly start to grow algae and turn green. Water without chlorine, especially if it has an algae bloom, is unsafe to swim in, and can be a breeding ground for mosquitoes and other insects. The second thing that causes pool water to look green (or yellow) is pollen.
Swimart's tips for turning your pool from green to clean: Check your chlorine levels. If below 0.5ppm you need to 'shock' the pool water with a large dose of chlorine to 10ppm. Ensure the filters are running and don't use the pool until the chlorine level falls below 3ppm. Lower the pH levels by adding acid.