There are 3 components to the chlorine level in the pool. Total chlorine, Free chlorine, and Combined chlorine. Free chlorine is the chlorine available for sanitation.
Put less chlorine in or turn the chlorinator down if you have a salt water pool the chlorine that is already in the water is dissipating all the time, so you don't have to worry about that.
You need a test kit to determine free chlorine levels. To reach those levels you test the water and add chlorine until you achieve the required amount ( 1.5 to 5.0 ppm) of chlor. The first reading on...