Organic material consumes chlorine
Algae, leaves, pollen, swimmer waste, and other contaminants can use chlorine faster than normal.
Sunlight and stabilizer matter
Too little stabilizer can allow sunlight to burn chlorine off quickly. Too much stabilizer can make chlorine less effective and complicate treatment.
Phosphates may support algae growth
High phosphate levels can contribute to persistent algae pressure, which increases chlorine demand.
Equipment and circulation must work together
Poor flow, short run times, blocked baskets, dirty filters, and dead spots can prevent sanitizer from working evenly throughout the pool.
Every pool is different.
This article provides general educational information. Pool condition, equipment, water chemistry, and site conditions should be evaluated before choosing a treatment or repair plan.