Did You Notice Black Spots In Your Pool? Here’s How To Remove Them

A pool is something that every household wants. It can be a great place to spend time with family and friends in the summertime, or even just for relaxation during the winter months. Unfortunately, it’s not uncommon for pool owners to start noticing black spots in them. This article will discuss what pool black spots are and how you can remove them from your pool.

What are black spots in pools, and what causes them?

The black spots in the pool are caused by the pool being exposed to air. When a pool is exposed to air, it causes rust and debris from your pool surface and sides of the pool to be oxidized. This oxidation grows black spots over time that can appear as small or big black dots on any side of your pool. It’s important you know what they are so you remove them from sight quickly before they have an effect on other areas of your pool. 

Algae can also be a problem if the pool water is not kept crystal clear. Algae in pool water will turn the pool surface black as it grows over time, causing black spots or dots to appear on any side of your pool. Luckily, there are ways to remove algae stains present in your pool and it’s important for you to know that. It’s also very crucial to learn how to prevent it from happening again.

Pool chemicals can’t remove black spots on your pool liner

Unfortunately, pool chemicals can’t remove black spots on pool liners. In fact, pool chemicals can actually make the black spot problem worse! Black pool spots are usually caused by one of four things: dirt in your pool water, algae growth (usually green or brown), iron deposits, and rust stains from metal objects such as ladders and pumps. Pool chemicals cannot remove any of these pool stains.

This is because pool chemicals are designed to work on pool contaminants like dirt, algae growth, and metallic pool stains. These treatments do not usually include a pool stain treatment or metal cleaner, they only remove certain types of pool stains (dirt & metals).

If you have black spots in your pool liner that won’t go away no matter how much chlorine and algaecide you add, it’s time to contact an expert pool maintenance company for advice! An expert can test the water chemistry of your pool as well as inspect any visible damage inside and outside the cover.

How to identify black spots on your pool

In order to identify black spots on your pool, you’ll need to use a black light. This ensures that the black spot is glowing in contrast with the color of your water. Take a blacklight and place it at an angle from the black area so that all parts are covered by the UV rays. 

If there’s only one black dot/spot, then this means that you have algae growing on certain areas of your swimming pool surface which can be harmful to bathers’ health if not removed soon enough. That is why it’s crucial to identify black spots on your pool as soon as they appear.

Black spot removal tips 

Once you know what is causing the black spots it’s time to learn how to remove them. Here are the steps:


  • Brush black spots off your pool walls and floors with a stiff brush. 
  • If the black spots are on your vinyl liner, scrub them gently to avoid damaging them. 
  • Use an algaecide that targets black stains after brushing as instructed by the product label. This will prevent color-staining algae from returning in future summers or if you redo your chlorine levels again next year.  


Use these steps consistently for best results when removing black spot buildup around pools: Once every week during heavy use periods; once per month while not in use before closing up for winter months (if applicable).

Ways to prevent future occurrences of black spots 

In order to prevent black spots from appearing in your pool, there are several steps you can take. The first is to make sure that the pH of your pool water is at a proper level. A black spot on vinyl surfaces will only appear if the chlorine has been neutralized and cannot do its job of sanitizing your water properly. An ideal range for the pH of pool water is between seven and seven point five.

Troubleshooting steps for when the problem persists after following all prevention methods

If the spots do come back, here are some tips you can take to troubleshoot the issue. Scrub off any black stains or organic growths with chlorine tablets in a bucket of water before refilling your pool. If black spots formed on the tile, you may need to scrub off any black stains or organic growths with chlorine tablets in a bucket of water. Make sure that your pool has good circulation and filtration systems as this will help keep black spot algae from forming again.

Now you know how to fix the black spot problem in your pool. Make sure to follow the instructions carefully and make sure algae doesn’t come back by preventing it the next time. Learn how to identify the spots and solve the problem as soon as possible. Enjoy your swim!