Turn off your pump.
Turn off your pump system and bypass the timer.
Lower chlorine to 0.3 ppm
Lower your chlorine reading to less than 0.3 ppm by either using chlorine nuetralizer or abstaining from adding your sanitizer for a few days.
Lower pH to 7.2
Lower your pH to 7.2 by adding No Mor Muriatic Acid or liquid acid. You can add more as necessary.
Add Super Stain Treat™
Add one (1) bottle of Super Stain Treat™ per 15,000 gallons of pool water.
After 5-10 minutes brush the walls of the pool. One good brush over the wall should be fine.
Slowly rebalance your pool. Once your pH is above 7.2 you can turn on your pump.