Can you over Chlorinate?

[Simmons99]

Thanks guys. My pool is about 25K gallons. The chlorine level is still at 30 ppm and the water has gone from cloudy green to a dull blue (I can see the bottom of the 4 ft but not the 7 ft). I will backwash now and monitor.

Looks like you have killed the algae - so it will need to filter out. Keep your chlorine high until the pool clears - it will clear-up quicker that way. You can try turning off the pump to let it settle - then vacuum to waste (if losing all that water isn't a problem).