What do Copper stains in pools look like?

Copper stains in pools usually appear as a light (mint) green or a light brown/grey stain on the surface. For example, copper stains often look like green algae.  So, some people will shock dose their pool with chlorine.  When they do this, it oxidizes the copper which turns the copper into a dark colour almost instantly.
So, even without shock chlorination, copper stains in swimming pools will get darker and discoloured by chlorine and minerals over time. Also, over time, they appear in various colours and shades on the pool surface. Remember, copper stains are the same in colour or appearance as algae.  Therefore, this will lead to incorrect diagnosis and treatment. In short, copper stains are the most common misdiagnosed stain that we see, even with pool professionals.   

Signs of copper staining:

  • Coloured stain that won’t brush away
  • Stain getting worse over time
  • Stain slowly changing colour
  • Chlorine treatment makes stain darker
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Copper Stains in Swimming Pools The Pool Stain Removers 1
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Copper stains in pool – likely causes

Copper staining occurs when you introduce copper sulphate into the pool from copper-based products.  For example, these include sulphate blocks, copper and silver sanitation systems, low-quality pool salts, copper-based algaecides or blue clarifier blocks. In fact, these products add invisible copper ions to your water.

So, if copper is not removed or managed, staining will occur, especially if the water pH exceeds 8.3. Remember, high pH causes suspended (floating) copper ions to ‘plate out’ or bond to the pool surface. Subsequently, this causes discolouration and a stubborn stain.

Also, unbalanced water will strip copper from the pipework in heat pumps and bring it into the pool water.

Likewise, poor-quality pool salt may contain copper.  So, when you dissolve the salt into the water, copper is dissolved into the water and will stain the pool surface.

So, you should remove copper right away to stop it from staining your pool.

Products that will introduce copper:

  • Copper based algaecides
  • Low quality pool salt
  • Pool heater copper pipes
  • Copper sulphate blocks
  • Bore water
  • Chlorine free pool systems

Remove copper stains from pool – easily

We remove copper stains every day with our treatment from any pool finish including Pebblecrete, Quartzon, fibreglass, glass bead, or fully tiled pools. Remember, we remove copper stains from swimming pool surfaces without draining the pool or acid washing. Also, after removing the stains with our kit, if you remove the copper from the water then the pool then the stains will not come back. Remember, removing the copper from the water will not remove the stains. In short, you first have to dissolve the copper first before you try to remove it!
So, if you are unsure of the type of stain you have please feel free to Contact us.  Remember, there is no cost or obligation.
Copper stains from Chlorine
stain from magnapool salt
metal stains in pool
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OPTION 1 – Copper Stain Removal DIY kit

What We Do 1


pool stain removal


pool stain removal



  • 1 Litre of our powerful copper stain release and prevention formula
  • 4 Kgs of granular copper stain dissolving compound
  • Phone support from our technicians
  • Simple step-by-step instructions included
  • Pool does NOT need to be drained
  • Kit is tracked and delivered by Fastway Couriers
  • Kids are back in the pool in just 7 days
  • Kit is $295 for pools 40,000+ Litres


Enquire now!

OPTION 2 – Copper Stain Removal – On Site Technician


pool stain removal


pool stain removal



  • 1 Litre of powerful copper stain prevention formula
  • 4 Kgs of our granular copper stain dissolving compound
  • Complete on-site water test
  • Your pool does NOT need to be drained
  • Kids are back in the pool in 7 days
  • Visit is $465 for pools 40,000+ Litres


Enquire now!

Removing copper from pool water

CuLator Metal Eliminator will remove the copper from pool water after our treatment has removed the stains. Importantly, this product will remove copper ions from the water to help prevent the stain from reappearing later. Remember, our standard treatment will dissolve copper stains but will not physically remove all the copper from the water. In Short, common liquid metal treatments only ‘suspend’ rather than actually remove the copper from the water.

In addition, CuLator Metal Eliminator is unique because it can actually remove copper from pool water. Finally, your pool shop will assist you in measuring the copper levels in your pool water.  Remember, you need to get the copper out of the pool, not just control it.

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**IMPORTANT NOTE: Remember, we are able to remove almost all pool stain types. However, we strongly suggest that you act on copper stains as soon as they appear. Importantly, if you leave the copper stains in your pool for longer than 1 – 2 years they are often absorbed deep into the pool interior. As a result, heavy copper stains can discolour your pool interior. So, in these situations, copper staining may still be visible or reappear within a few weeks even if the pool is completely drained and acid washed. Furthermore, in some extreme cases, very heavy copper staining may require two full treatments to be completely removed. So, do something about it now!