If you'll fill out the pool chart form, we'll be able to answer better:
Pool Chart Entry Form
Pool Chart Results
Meanwhile, a good start would be adding 7 gallons of PLAIN 6% household bleach to your pool each evening, until the water changes from green to gray or bluish (still cloudy). The first evening AFTER it changes color, add the bleach and then brush the pool completely.

More . . . once you get your pool data posted. Say so, here, when you do so I'll be notified.