Top 10 Causes of Green Pool Water and How to Fix Them.

Help! My pool water is clear green
  • Here are the top 10 causes of green pool water (ranked by how often they happen in real-world pools) and how to fix them:
  1. Algae Growth – The #1 cause. Algae thrive when chlorine is too low or circulation is poor.  FIX by shocking the pool or adding an algaecide.  Just be careful with copper based algaecides as they add copper to the water (use a CuLator Metal Eliminator to remove the left-over copper) 
  2. Low Free Chlorine Levels – Without enough sanitizer, algae and bacteria quickly multiply, turning the pool green.  FIX by shocking the pool and keep the free chlorine level between 1-3.  You may need to keep the chlorine level elevated until the water clears.
  3. Poor Filtration or Circulation – If the filter is clogged, undersized, or the pump isn’t running long enough, algae spores settle and bloom.  FIX by cleaning the filter(s) and check the pump.
  4. High Phosphates/Nitrates – These act as “food” for algae, accelerating growth even if chlorine is present.  FIX by using a phosphate remover or drain some of the water from the swimming pool.
  5. Imbalanced pH – High or low pH can reduce chlorine effectiveness, allowing algae to take hold.  FIX by raising or lowering your pH.  Salt systems often have higher pH.  Check the pH regularly.
  6. High Cyanuric Acid (Stabilizer) – Too much CYA locks up chlorine, leaving the pool under-sanitized despite good chlorine readings.  FIX by training some of the water from the swimming pool.
  7. Metals in the Water (Copper/Iron) – Oxidized copper can give a green tint, especially after shocking. Iron can also cause discoloration.  If the pH goes up too high, then metals may “plate out” onto the surface as a stain.  FIX by using a CuLator Metal Eliminator to remove the metals and prevent stains.  Also you can prevent staining by using a sequestering agent like Mega Maintain.
  8. Warm Water & Sunlight – Heat and direct sun speed up algae reproduction and chlorine breakdown.  FIX by checking your chlorine levels regularly.
  9. Organic Debris – Leaves, pollen, dirt, and other matter feed algae and deplete chlorine.  FIX by removing debris frequently and running the filtration system regularly.
  10. Low Alkalinity –  If your alkalinity is low, you may get green water, which is also aggressive water.  FIX by raising the alkalinity to 80-120 for liners and 100-125 for plaster.

NOTE: Most of the time, green water is a chlorine and algae problem, but metals (especially copper from algaecides and damaged heaters and iron from salt systems, bricks, pavers, or stones around the pool, screens around the pool, run off from irrigation, and well water) can also be the culprit.  If your water is clear, but green, then you most likely have a metal issue. If the swimming pool water is cloudy, and green, that is an indicator that you need to add chlorine to the water to get rid of the cloudiness and then treat the metals.

Is the CuLator Still Working When Puffed Up?

We get questions about if CuLator is working and when you know it is finished and needs to be replaced.

Here is an example of a question:

Love your product my pool had very high copper levels after 4 days my bag is blue and puffed up. Should I take it out if it is puffed up ? I bought the 1.0 and seems to really be working so I purchased the 4.0 also!

Here is an answer:

When the CuLator is puffed up, it means the CuLator polymers have “hydrated”.  This is normal and does not mean all the metals have been removed from the water.  When the contents of the CuLator bag shrink to half their size, or the contents feel watery or like pebbles inside, then it is time to replace the CuLator.  This may take 1-3 months with the CuLator 1.0 and up to 6 months with the CuLator Ultra 4.0.

When the contents of the bag turns blue (or another color), that indicates that metals are being removed from the water.  The best way to see if metals are being removed is to hold the bag up to the light (with the light behind the bag) and see if there is a color INSIDE the bag.

If the bag is “puffy” it still has capacity to remove metals from the water.  If you aren’t sure you can always call Periodic Products at 954-764-7654.

 

CuLator Ultra 4.0 hydrated and puffy.
When the CuLator is Puffy There is Still Capacity to Remove More Metals from Pool Water
Used CuLator with Copper Removed From the Pool.
CuLator 1.0 Used and Blue Indicates Copper was Removed from the Pool Water

We also have a product call the CuLator Metal Indicator Tabs, which is an easy visual to use to determine if you have metals and which one you have in your pool water.

CuLator Metal Indicator Tab Showing Copper Present in Pool.
Metal Indicator Tab Turns Blue/Teal Indicates Copper Present in Pool Water
CuLator Metal Indicator Tab- Indicating iron is in the swimming pool water
Metal Indicator Tab Turns Yellow/Orange/Rust Indicates Iron Present in Pool Water

CuLator Removed Copper From My Swimming Pool!

Thank you kindly for the information!  Historically, for the pool, I’ve simply used the CuLator 1.0 packet in my skimmer basket with good results.  I did try the CuLator 4.0 inside the GatorCage as an upgrade/replacement, but it did not seem to perform much differently.  Not complaining, but if the 1.0 is working, it would be simpler for me to just continue that routine.

As far as actual movement and lifespan, continuously using on of the CuLator packets has kept my copper levels fairly steady at 0.1 ppm.  Sometimes 0.0 and sometimes 0.2, but very flat.  I was north of 1.0 and going higher when I started using them just under 2 years ago when we bought the pool.  Previous owner did not unfortunately manage the water chemicals very well – pH way out of spec, ridiculously high chlorine and CYA, plus he added algaecide doses every week…

Everything is now in much better shape, but I think there is some damage to either the heater and/or copper pool pipes (underground) allowing them to leech copper still.  However, I do think it is getting better (reduced)!   Actually planning running for several weeks later this summer when I have a bit more free time without the CuLator to see how fast the levels are rising, but assume there will still be a need long term for the CuLator.

Thank you again!

CuLator with Copper Removed from Swimming Pool Water

Phoenix Arizona has Copper in Water

CuLator removes copper from Phoenix water
The colors inside the CuLator show metals removed
CuLator turns colors depending on metals removed from swimming pool
Blue shows copper, yellow shows iron, and the green is a combo of metals removed

Phoenix Arizona has Copper in Water

Phoenix, Arizona is dealing with a major copper issue in the municipal water.  When Phoenix residents fill their pools with city water, they are adding high levels of stain-causing copper, which can stain swimming pool surfaces or cause water discoloration.  

If you shock a swimming pool with copper in it, the pool water can turn bright green, or grayish or blueish stains can appear on the surfaces.

If the copper level is below .2 ppm, you should be safe from staining.  However, the goal is to have a swimming pool with 0 copper.  If your copper level goes up to .3, then you are at risk of staining all the pool surfaces.  

So, what can you do about a pool with copper in the water?

If you have copper in your swimming pool water, then you should use some Mega Maintain Sequestering Agent to suspend the copper in the pool water.  Next (at the same time) add a CuLator 1.0 to the skimmer basket or a CuLator Ultra 4.0 to your bump basket and let it remove and eliminate the metals from your water.  

What’s great about CuLator is that it is non-toxic and removes high levels of metals including copper, iron and manganese.  Those are the three metals which stain pools the most.  The other great thing about CuLator is the contents of our PowerPak bag change colors.  

What can you do if your pool is stained with copper?

We recommend using the Metal Stain Eliminator Kit.  It is a no-drain kit which removes metal stains, sequesters the metals (suspends the metals in the water), and removes or eliminates the metals from the swimming pool with CuLator Metal Eliminator and Stain Preventer.

How do I know my CuLator is working?

We get asked this question all the time.  The answer is to look UP at the CuLator with a light or sun behind it.  This will show the color of the metals removed.  You will notice that iron turns the CuLator a yellow color and copper turns it a blue color.  Sometimes you will see both.

Is My CuLator Working?

Happy Customers Make Us Happy!

Here is an email from a happy CuLator customer on 05/08/19:

Lynne,

Wow this is a fast response . Just what I needed . I love your products by the way . The CuLator is the only thing that has worked for me . I saw David M. had also called me back.

Tell him thank you also

I will continue to be a loyal customer of your products

Thanks again

Paul C.

We love customers like Paul!  Thank you for sharing your comments!