Why is my pool plaster staining?

The plaster in your pool can be stained by algae, minerals and heavy metals in the water, imbalances in water chemistry and outside elements that you introduce, such as sunscreen or tanning oil. These unsightly stains should be removed as soon as possible for the best results.
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What causes stains on pool plaster?

Most metals, when subjected to swimming pool water chemicals, will react and leave a stain where they were in contact with the pool's plaster. The most common objects to stain swimming pools are soda or beer cans, pop tops, and coins. These items can cause a stain as quickly as overnight.
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How do you get stains out of a plaster pool?

For extreme staining or serious algae blooms, plaster pools can be cleaned with an acid wash with muriatic acid, or the safer to use Acid Magic. Acid washing removes a thin layer of plaster, exposing bright white and unstained plaster underneath. Having your pool acid washed will remove most surface stains.
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Why is my pool stained?

These are likely caused by leaves, berries, algae, worms, dead animals, or other organic debris that will leave stains if allowed to settle on the pool surface. If they are not removed right away, they will sink down and begin to decay on your pool's floor. Fortunately, organic stains can be easy to remove.
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What are the brown stains in my pool?

Brown swimming pool stains have many sources. Algae, metals, calcium buildup, and just plain dirt.
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Brown Stains on Pool Plaster



What is the life expectancy of pool plaster?

Depending on a variety of local factors and your individual pool-water treatment routine, the typical lifespan of traditional marcite plaster is 7 to 10 years. If the finish includes a quartz aggregate blend, the time table should extend another five years.
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How do I get the brown stuff off the bottom of my pool?

Since brown algae is extremely chlorine-resistant, several other chemicals such as shock and an algaecide specifically designed for mustard algae will help get rid of the infestation. This will often result in cloudy pool water, so use clarifier to correct this problem.
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How often should I Replaster my pool?

On Average, Replastering is Every 10 Years

So how often do you need to replaster a pool? The short answer is about every 10 years. However, it's important to consider the factors mentioned above, as they are typical signs that your pool needs to be replastered.
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How do you know if your pool needs resurfacing?

Before you call for help, learn the ten signs that you need help from a pool resurfacing service.
  1. Plaster Flaking or Peeling. Maybe you've noticed the plaster is peeling along the steps or floor of your pool or spa. ...
  2. Surface Stains. ...
  3. Roughness. ...
  4. Check Cracks. ...
  5. Plaster Discolorations. ...
  6. Structural Cracks. ...
  7. Rust Stains. ...
  8. Loss of Pebbles.
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Can you pressure wash a plaster pool?

Only pools constructed of plaster, exposed aggregate, or concrete are strong enough to withstand the power of a pressure washer. Any other type of pool, such as vinyl or fiberglass, must be cleaned using chemical treatments or using non-abrasive methods.
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Why does the bottom of my pool look dirty?

If dirt is reappearing at the bottom of your swimming pool after you've vacuumed it your pool's filter may be working poorly. Pool filters often work poorly because they're in need of cleaning. If you have a sand filter for your pool you need to make sure that the sand is sharp and freshened up.
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Why did shock turn my pool Brown?

Brown pool water is often caused by metals (iron) becoming oxidized in the pool water. If you shocked your pool water and it turned brown you probably have metals. Oxidized iron usually turns a brown or rusty color in the water.
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Can you swim in a pool with brown algae?

Getting Rid of Brown Algae in a Swimming Pool. A swimming pool with a buildup of algae on the walls or floating on the pool surface is unsightly and unsafe for swimming.
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What happens if you don't Replaster a pool?

Either due to age, excessive acid washing, or a poorly done previous plaster job, the surface of the pool may become rough. This can cause snagged swimsuits, scraped skin, and algae that is extremely difficult to remove.
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Is it OK to leave a plaster pool empty?

If the pool ever needs to be drained to replace the water or to maintain the plaster, it should never be left empty for more than eight to ten days at the most. More than this may cause the plaster to dry out and crack. Keep your pool full for best results.
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What happens if you don't resurface pool?

If you don't resurface the pool, which is necessary because it is always exposed to weather, cracks and an unevenness in the pool surface will occur and this could lead to algae stains, water leaking and injuries from the uneven surface.
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How do you identify pool stains?

How to Identify a Pool Stain
  1. Organic stains – green, yellow, or brown and is a result of leaves, algae, mud, or other natural debris.
  2. Metal stains – reddish-brown, or very dark in color and will commonly appear after chlorine is added or after the swimming pool is shocked with granular chlorine.
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Does muriatic acid remove pool stains?

Along with balancing the pH levels of your pool water, muriatic acid is strong enough to kill mold, remove rust stains, get rid of calcium deposits, and clean the surfaces of your pool.
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Why does my pool have yellow stains?

When there is too much of a mineral present in the water, it can begin to stain the pool. Shades of yellow can be a sign of excessive iron. Iron can be introduced into a pool by well water or pipe corrosion somewhere in the pool system.
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