Chlorine sanitizes your pool by killing algae, bacteria, and other contaminants. When chlorine levels drop too low, algae can begin growing quickly, especially during warm weather.

Several factors reduce chlorine levels, including:

• · Hot summer temperatures
• · Heavy pool use
• · Rain or debris entering the pool
• · Incorrect chemical balance
• · Infrequent maintenance

Once algae begins spreading, simply adding chlorine without correcting other water chemistry issues may not solve the problem.

Even properly balanced water can develop algae if it isn't circulating effectively. Water should move continuously through the filtration system so chemicals reach every part of the pool. Dead spots behind ladders, steps, corners, and water features often become the first places where algae develops. If circulation is poor, algae has an opportunity to grow before sanitizers reach affected areas.

Your filter removes dirt, organic material, and microscopic particles from the water. A clogged or dirty filter reduces water flow and prevents proper filtration. As debris accumulates, water quality declines and algae becomes more likely to develop. Regular filter cleaning is one of the simplest ways to prevent green water.

Many homeowners focus only on chlorine, but chlorine works best when the rest of the water chemistry is balanced. Important factors include:

• · pH
• · Total alkalinity
• · Calcium hardness
• · Cyanuric acid (stabilizer)

When these levels fall outside their recommended ranges, chlorine becomes less effective, allowing algae to multiply even when chlorine appears to be present.

Leaves, pollen, grass, dirt, and insects all introduce organic material into your pool. As this debris decomposes, it consumes chlorine and creates conditions that encourage algae growth. Pools located near trees or exposed to frequent wind often require additional cleaning to stay ahead of algae.