Why Is My Pool Green?

Your swimming pool is one of the best investments you’ve made for both increasing your home’s value and for making memories with those you care about most. And like every responsible pool owner, you’re doing everything you know how to do to keep your pool water clean, sparkling, and healthy. But no matter what you do, the water in your pool might look great one day, and then…your pool is green. Or it might slowly turn from clear to green over a period of time. Either way, what causes your pool to turn green? How can you get rid of all that green water so you can enjoy your pool again?


There are several reasons your pool can turn green, and it’s important to know the cause of the issue so you can better understand how to turn that water from green to crystal clear again. Here are some common culprits that can turn your pool water green:

  • Algae in the water. There are several reasons why algae could grow in your pool, but the most common causes are a chemical imbalance, excessive rain, or a change in the amount of sun exposure on your pool.
  • Excessive pollen. While we love those beautiful Arizona flowering plants and trees, the pollen they produce can wreak havoc on your pool water, turning that water a lovely shade of green.
  • Insufficient filtration. If your filter is damaged or not running long enough, your pool can turn green.
  • Deteriorating equipment. If your equipment isn’t in the best of shape, the chemicals in your pool can react negatively to the oxidation of the exposed metal components of your equipment, resulting in a chemical imbalance and colored water.
  • Broken cleaning equipment. Faulty cleaning equipment cannot clean your pool correctly, resulting in not only green water, but other issues as well.
  • Inconsistent cleaning. Dirty water turns green, plain and simple. If you’re not cleaning your pool per the builder’s suggestions, you will experience issues with your water quality, including green water.
  • Chemical imbalances. While the factors we’ve mentioned above can cause an imbalance in your pool’s chemicals, if there’s too little chlorine in the water, or high levels of cyanuric acid, pH, or phosphate, green water can be the result.This process takes at least 30 minutes a week, and since time is money, it’s important to compare the cost of the time you’ll spend versus the time you’ll save by hiring a professional. If you spend the minimum 30 minutes a week, 52 weeks a year, you’ll be spending at least 26 hours a year just on basic pool maintenance. That time cost doesn’t take into account any issues you run into if you can’t quite get the chemical levels right in the water, removing debris after storms, and so on.

So, when your water turns green, what can you do?

Green water can often be fixed by testing and then correcting any chemical imbalances, repairing faulty equipment, using a pool cover (to keep that pollen away), and/or more consistent cleaning and maintenance. Sometimes, you can fix the green water issue yourself through testing the water and then adding the appropriate chemicals or by increasing your cleaning. But if what you’re doing isn’t working, or if the water is beyond your ability to fix, you might have to drain, power wash, and refill your pool with balanced water, all of which can be costly. Before going to that extreme, or even at the first signs of green water, consulting a pool care professional can often solve the issue quickly with less frustration, and they might even save you some money. Our mission at Salten Pools is to do all the work so you can have all the fun AND to keep your pool water crystal clear.

Contact us today to see how we can best serve you and your pool needs, green water or not!

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