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Pool Stains: 2 Types, Many Solutions!

pool stain, algae, stains


The Ultimate Guide to Identifying, Removing, and Preventing Pool Stains

Owning a pool is one of life’s little luxuries, especially during those scorching summer days. However, along with the fun and relaxation, there comes a less-than-glamorous aspect of pool ownership—dealing with stains. These unsightly spots can quickly turn your sparkling oasis into a colorful mess. But don’t worry! In this ultimate guide, we’ll walk you through the types of stains, how to remove them, and, most importantly, how to prevent future stains from making a home in your pool.

What Are Pool Stains?

Simply put, they are discolorations on your pool’s surface. They can be caused by various factors, from organic debris to metals in the water, and they can range from light discolorations to deep, unsightly marks. They not only affect your pool’s aesthetic but can also indicate underlying water chemistry issues. Understanding the types of stains and what causes them is the first step toward keeping your pool spot-free.

Types of Pool Stains

There are two primary categories: organic and metallic.

1. Organic

Organics are the result of natural debris entering your pool. Leaves, berries, algae, and other plant matter can all cause organic stains. These typically present as green, brown, or blue patches on your pool’s plaster. Organics can be relatively easy to removed if caught early, as they usually sit on the surface of the pool.

2. Metallic

Metallics occur when metals like iron, copper, or manganese oxidize in your pool. These metals often enter the pool through metal pool equipment, pipes, or even from certain types of algaecides that contain metals. Metallics often appear as reddish-brown (from iron), green or turquoise (from copper), or black (from manganese). Metallics are more challenging (if not impossible!) to remove and may require special treatment. They may even be permanent. If you suspect that you have metals, the first thing to do is to remove them. For that, we recommend CuLator.

Common Causes

Understanding the causes can help prevent them in the future. Here are the most common culprits:

  • Organic Debris: Leaves, algae, dirt, and bugs are all natural contributors. When left too long in the pool, these can decompose and leave behind unsightly marks.
  • Metals in Water: Metals can enter your pool water through corrosion of metal components or from source water with high metal content. If left untreated, these metals can cause stubborn metallic spots.
  • Imbalanced Water Chemistry: Poor water chemistry can lead to increased metal activity and organic spots. High pH levels, improper chlorine levels, and low alkalinity can all increase the likelihood of these issues.
  • Improper Use of Algaecides: Some algaecides contain copper or other metals, which, if overused, can lead to metallic spots in your pool.

How to Identify

Before tackling the issue, it’s essential to identify what type of stain you’re dealing with. This will determine the best removal method.

  • Organic: Typically green, brown, or bluish stains. You can test for organics by applying a small amount of chlorine directly to the spot. If it lightens or disappears, it’s organic.
  • Metallic: Often appear as rust-like (iron), green or turquoise (copper), or black (manganese). You can test for metallics by rubbing a Vitamin C tablet directly on the stain. If the stain lightens or disappears, it’s likely a metal stain caused by oxidation.

How to Remove Pool Stains

Once you’ve identified the stain, it’s time to remove it. Here are the best methods for dealing with pool stains.

1. Removing Organic Stains

Organic stains can usually be removed with regular pool shock treatment. Here’s how:

  1. Shock the Pool: Raise your pool’s chlorine level by using a pool shock product. This should help bleach out any organic stains.
  2. Brush the Stain: After shocking, brush the stained area with a pool brush to help loosen and remove the stain.
  3. Maintain Clean Water: Ensure your pool’s water is kept clean by skimming and vacuuming debris regularly.

2. Removing Metallic Stains

Metallic stains require more specialized treatment. Follow these steps:

  1. Use Ascorbic Acid: Apply ascorbic acid (Vitamin C) directly to the stain. This will help lift most metal stains from the pool surface.
  2. Metal Sequestrant: After treating with ascorbic acid, add a metal sequestrant to your pool water to bind any leftover metals and prevent further staining.
  3. Balance Water Chemistry: Ensure your pool’s pH and alkalinity levels are properly balanced to prevent metals from oxidizing again.

How to Prevent Pool Stains

While removing stains is necessary from time to time, preventing them is always better. With proper care and attention, you can avoid the hassle of stains in the future.

1. Maintain Balanced Water Chemistry

The best way to prevent pool stains is by keeping your water chemistry balanced. Regularly test your water to ensure your pH, chlorine, alkalinity, and calcium hardness levels are in the correct range. Balanced water not only helps prevent stains but also prolongs the life of your pool and its equipment.

2. Keep Your Pool Clean

Skimming your pool for debris, brushing the walls and floors, and vacuuming regularly will help prevent organic matter from settling and causing discoloration. Make pool maintenance part of your routine to keep color spots at bay.

3. Use a Metal Sequestrant like CuLator

If your pool water contains metals, regularly use a metal sequestrant to bind those metals and keep them from oxidizing. This will prevent metallic stains from developing on your pool’s surfaces.

4. Cover Your Pool (not recommended in Texas)

When your pool is not in use, covering it can prevent debris from entering and minimize the risk of organic problems. Pool covers are an excellent investment for reducing the amount of maintenance required and keeping spots away.

5. Monitor Source Water

If you are filling your pool with well water or water that has a high metal content, consider using a pre-filter to reduce the amount of metals entering your pool. Additionally, be cautious when using algaecides containing copper, as they can contribute to these problems if overused.

When to Call a Professional

If your pool stains persist despite your best efforts, it may be time to call a professional pool service company. Professional services can provide more advanced removal techniques, including acid washing or specialized cleaning treatments that can restore your pool’s surface. Keep in mind, that sometimes stains are permanent, and may not be removable despite best efforts.

Conclusion

Pool stains are an unfortunate reality for pool owners, but with the right knowledge and techniques, they can be effectively managed. Regular maintenance, balanced water chemistry, and proper removal methods will help you keep your pool looking pristine. By understanding the causes and how to address them, you can ensure your pool remains an inviting, color-free retreat for years to come.

Remember, if you’re ever unsure or dealing with persistent problems with your pool, it’s always best to consult with a professional. These issues don’t have to ruin your pool experience—stay on top of them, and enjoy your sparkling, clear water all year long.

For more helpful information, check out our BLOG!

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