9102 Sweetbrush Dr, Houston, TX 77064
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19 Jul 2022  /  by Aqua Blue Custom Pools   /   0 Comments

Why is my Swimming Pool still Green?

This is a great question to ask for a frustrating problem. Your swimming pool at home might take some time to recover from a pool algae infestation. Removing algae from your pool will not bring about an immediate change, and sometimes it takes a few days to see the full effects.

Let's discuss why your green pool isn't returning to its pre-algae appearance.

Your swimming pool was cleaned of the algae plague in no time. You have eliminated all the algae, but your pool is still green. You checked the water chemicals and were shocked like never before. Then you added algaecide to your pool. Finally, you ran your filter till it stopped moving.

Why is your pool not returning to its natural, beautiful color?

You have balanced your pool water chemistry.
After dealing with an algae problem, you’ll likely be a pool water chemistry expert. To eliminate algae, you must not only shock and use algaecide but also test as well as balance water. Maintaining a healthy pool is essential to keep the water chemistry balanced. Some chemicals, such as pH and Total Alkalinity, are more effective in fighting algae and green pools when they are slightly out of the ideal range.
pH: 7.4-7.6
Keeping your pH slightly lower than usual when fighting algae is a good idea, making your pool more acidic or corrosive. Although acidic water can harm equipment and the pool surface, it can chip away at algae faster. After the algae have been eliminated, increase the pH to the recommended range.
Total alkalinity: 80-120ppm
Like pH, keeping your Total Alkalinity slightly lower than usual will give you an additional boost when removing algae. After removing the algae, increase the Total Alkalinity to the same range as before.
  1. Cyanuric Acid: 20-30 ppm
  2. Calcium Hardness: 200 – 400 ppm
  3. Chlorine – 2.0-4.0 ppm
  4. Total Dissolved solids: 1500ppm
  5. Phosphates: < 300 ppm
1) You’ve Shocked Your Pool
Pool shock is another example of such chemicals. Shock labels will tell you to use 1lb shock for every 10,000 gallons. This is a good rule to follow if you are shocking your pool water as a precautionary measure, such as after a storm or party. You can get wild with shock if you are trying to kill pool algae.
Okay, don’t get crazy. But you can add more shock to the fight against algae. You can add more shock if you have a green pool even after the first round. You may need to use 3x or 4x as much shock to eliminate your algae pool, and the shock will kill the algae and clear your pool water. It is important to shock your pool at night so that the sun doesn’t evaporate the water.
2) Algaecide was used
A common misconception is that algicide kills all forms of algae. This is false. The only things that can eliminate algae are pool shock and the right water balance, and an algaecide is only a preventative measure. The algaecide creates an unhospitable environment in your swimming pool, so algae cannot grow. After you have completed the shock procedure and the green pool has begun to clear, you can add an initial dose of algaecide to your water. Then, add weekly maintenance doses.
3) The Filter is Running
You should run your pool filter more often to combat algae, just like you would with extra shock. We mean to run your pool filter extra often, and we don’t just mean 24 hours a day. Although it sounds excessive, this can be crucial in eliminating algae. Your pool water’s chances of succeeding will be increased by continuously circulating the shock or other algae-killing chemicals. After your pool water has been completely cleared, you can reduce the filter run time to 8-12 hours daily.
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Filter Wellness Check

For sand and D.E. For sand or D.E. To help your filter capture fine particles, a pool clarifyer can be used one day after aftershock. Sometimes, the D.E. or filter sand needs to be changed. Grids may be clogged or damaged. Filter cleaners can rejuvenate filter media, but it is eventually necessary to replace it.

There is still a green pool!

If your pool is still green after you’ve done all the above steps and failed to verify them, it could be a problem with your filter. If necessary, inspect your filter and replace any media. If this doesn’t solve the problem, you might need to purchase a larger filter that can handle more intense filtration. Drain some of your pool water as a last resort. You can drain about half your pool and replace it with fresh water to make it clear.

Final Recap

That was a lot to take in, we know. Here is a quick summary if you are in a green pool situation.
  1. If in doubt, balance the pool water’s pH and Total Alkalinity.
  2. It’s shock, shock, shock, and more shock. Perhaps shock will come back one more time…
  3. Algaecide does not kill algae. Once your pool is clean, you can use it weekly as a preventative measure.
  4. Your filter should run at least one full marathon per day.
  5. Final inspection: Drain your pool, if necessary.
It is not easy to remove and prevent algae, and it is possible, but it takes patience and a lot of elbow grease. Don’t be discouraged if your pool does not bounce back after treatment. You’ll be able to restore your Houston swimming pool in no time.
About Us

Aqua Blue Custom Pools is an inground swimming pool contractor located in Houston, TX. We specialize in creating custom pools and outdoor living spaces that are shaped around our customer's lifestyles.