Why Your Pool Water Is Green Even When Chlorine Is Balanced

Why Your Pool Water Is Green Even When Chlorine Is Balanced

Nothing is more frustrating than seeing green water in your pool, especially when your chlorine levels test perfectly balanced. So, what’s causing this mysterious discoloration? Here’s a closer look at the hidden factors that could be turning your pool water green—and how to fix them.

1. High Metal Content in the Water

Metals like copper and iron are common culprits behind green pool water. These metals can enter your pool through old plumbing, well water, or even certain algaecides. When exposed to chlorine, metals oxidize and give the water a green tint. Use a Digital Water Testing Kit to detect metal levels, and apply a metal sequestrant to clear the water.

2. Algae Growth in Its Early Stages

Even if your chlorine levels are within range, algae can start to form if other factors, such as pH and phosphate levels, are imbalanced. Early-stage algae might not be visibly slimy but can give water a cloudy green appearance. Regular testing with a precise water testing tool can catch these imbalances early.

3. Incorrect pH or Alkalinity Levels

Chlorine works best when your pool’s pH is between 7.2 and 7.6. If pH or alkalinity is off, chlorine becomes less effective at killing algae or oxidizing metals. Keep these levels in check with frequent tests and make adjustments as needed.

4. Residual Organic Debris

Leaves, pollen, and other organic debris can introduce algae spores and other contaminants that disrupt water clarity. Regular skimming and the use of a clarifier can help remove these particles before they cause green water.

5. Improper Filtration

Your pool filter is essential for removing contaminants that chlorine alone can’t tackle. If your filter is dirty or not running long enough each day, it may fail to clear particles that contribute to green water. Clean or backwash your filter and ensure it runs at least 8–10 hours daily during peak season.

How AquaDoc Can Help

Maintain crystal-clear water with AquaDoc’s Hot Tub Care Collection. From metal sequestrants to water clarifiers, our products are designed to solve stubborn pool issues quickly and effectively.

Brighten Your Pool

Green water doesn’t have to ruin your pool days. By addressing hidden factors like metals, pH imbalances, and filtration issues, you can restore your pool’s sparkle in no time. Regular testing and proper maintenance are the keys to enjoying pristine water all season long.

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