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Metal and organic pool stains and how they form

  • 3 min read

Swimming pools are a great source of relaxation and recreation, but they require proper maintenance to keep them in good condition. One of the biggest challenges pool owners face is dealing with stains that can develop on the pool liner. These stains can be caused by a variety of factors, but two of the main culprits are metal and organic materials that sit on the liner for long periods of time.


As a pool technician I have come across almost everything you can imagine during opening season. From large bricks and chairs to metal weights that were originally meant to hold the cover on.  The worst of these stains are created over winter while the pool cover is on. A simple nail can rust and leave a terrible mark on your liner that is very hard to ever fully remove. Sometimes even larger metal objects wind up overwintering in your pool during storms, or when part of your cover falls in.  When your cover falls in it can deposit large amounts of leaves, branches, and one of the worst organics ACORNS that will also discolor your liner.  These stains can really set in and discolor your entire pool.  Since your filter is off there is no water circulation and there are usually no chemicals being added during this time frame.


Metal stains are one of the most common types of stains found in swimming pools. They are caused by the presence of metals in the water, such as copper, iron, and manganese. These metals can enter the pool from a variety of sources, including the water supply, pool equipment, and even the swimmer’s bathing suits. Over time, these metals can accumulate on the pool liner and create unsightly stains.

Organic stains, on the other hand, are caused by the buildup of organic materials on the pool liner. These materials can include leaves, dirt, and other debris that are left sitting on the liner for long periods of time. Organic stains can also be caused by algae growth, which can occur if the pool water is not properly balanced.

Preventing metal and organic stains from developing on your pool liner during the swim season requires regular maintenance and proper care. Here are some tips for preventing these types of stains from setting in:

1.     Keep the pool water properly balanced:

Maintaining the proper pH and chlorine levels in your pool is essential for preventing both metal and organic stains. High pH levels can cause metals to precipitate out of the water and onto the pool liner, while low pH levels can cause organic materials to accumulate on the liner.

2.     Use a metal sequestrant:

A metal sequestrant is a chemical that can help prevent metal stains from developing on your pool liner. These chemicals work by binding to metals in the water and preventing them from depositing on the liner.

3.     Remove debris from the pool regularly:

Removing leaves, dirt, and other debris from the pool on a regular basis can help prevent organic stains from developing on the liner. It’s also important to skim the surface of the water regularly to remove any floating debris.

4.     Brush the pool regularly:

Brushing the pool walls and floor regularly can help prevent both metal and organic stains from developing. Brushing helps to dislodge any materials that may be stuck to the liner, making it easier for the filtration system to remove them from the water.

5.     Check out this new option:

https://www.poolstainsolutions.com/for chemical free stain options and some really cool decor ideas for all occasions.

It should now be apparent that metal and organic stains are two of the main culprits behind unsightly pool liner stains. Preventing these types of stains requires regular maintenance, proper care, and the use of appropriate chemicals. By following these tips, you can help keep your pool looking great and prevent stains from developing on the liner.

I do hope you found this article helpful.  Educating people about new chemical free options is the best way to help our planet.  Products available NOW!