Sanitizer and circulation problems
Green water often develops when sanitizer is insufficient, circulation is weak or algae gains enough time to grow. Several issues can occur together.
Recovery requires diagnosis
Adding chemicals without testing can waste time and money. The water, filtration, circulation and visible pool condition should be evaluated together.
Preventing a repeat
After recovery, a consistent cleaning, testing and equipment-observation routine makes it easier to catch changing conditions before the pool becomes severely green again.