Pink Algae in chlorine pool - help!

sued

Member
Sep 4, 2024
12
NY
Help!!! Apologize in advance the long post but I'll try to keep it brief and without pool test readings.

I've read through all of the threads and it appears I'm one of the lucky few who has a chlorine pool which has been infiltrated by pink algae (slime). Quick history; located in Hudson Valley, NY and for the past 28 years I've maintained my 40'x20' 40k gallon gunite pool fairly successfully and have come to understand pool chemistry with the help of my trusty Taylor test kit and local pool store specialists. Over the past few years, our area has seen a significant increase in rainfall which has been a challenge keeping the pool algae free. We typically open the pool around Memorial Day and close in late September so the swim season is short. This past summer has been absolutely the worse in trying to keep the pool water clear due to the onslaught of gypsy moth / caterpillar Fraz which literally bombarded the pool upon opening. I live in a wooded area and the pool is surrounded by trees. Multiple trips back and forth from the pool store, loaded with shock and baking soda did little to clear up the pool using the SLAM method. On top of that, the pool was heavily stained from metals in the water (ongoing problem for years). To rid the stains, I've done the Ascorbic acid, algaecide, metal sequestrate method several times this summer, then slowly increase chlorine levels to avoid the reappearance of stains. After the pool is nice and blue but not yet clear, a heavy rain would upset the delicate balance and cause algae growth, resulting in another heavy-duty pool shocking, PH balance... rinse repeat. This is the first year I've not been able to see the bottom of the pool but at this point it's not worth the trouble.

The critical problem now is a few weeks ago we had another series of nonstop storms and heavy rainfall but something different has shown up which I've never seen before; pink algae slime. Pool store analyzed water and advised shocking heavily and using algaecide which I've done. They are trying to throw so many chemicals at me that basically has done nothing to mitigate the problem except cost $$$. The pool slime has basically lined the walls of my pool and no amount of shocking, brushing, vac'ing, sand filter back wash is getting rid of this disgusting pink slime. We are a few weeks away from closing the pool for the winter and I'm concerned about doing this with the ever-present pink algae. The only positive is the frogs have basically taken residence and enjoy doing their daily laps.

The plan is to close the pool soon, forget about it over the winter, and drain it completely after opening in the Spring and replace with fresh water. I'm just worried about what kind of mess it will be once it's opened and what needs to be done prior to draining/replacing the pool water. I've also read that pink algae loves taking residence in crevices and pipes and pool filters.... What should I do? Pool store recommended a product called 'Pink Treat Algicide' that will supposedly wipe out the pink algae but based on my research, many have claimed that the Pink Treat will basically convert the pool into a bromide/bromine pool causing it to no longer hold chlorine. Should I roll the dice and try this product? Can I close the pool with little chlorine?

Here are pics of the pool after a fresh brushing; including the pink slime walls. Side note: For several years, I've added granular boric acid to the pool which has been effective in maintaining the PH level and keeping the pool water crystal clear. I did not do it this year due to the many other nature related challenges. I will be receiving a shipment of boric acid this week and plan on adding it to the pool which will hopefully stop (but not remove) the growth of algae. Any advice will be appreciated!
 

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have come to understand pool chemistry with the help of my trusty Taylor test kit and local pool store specialists.
Your local pool store specialists have no clue what they are doing and they have taught you to rely on their endless excuses and remedies.
Over the past few years, our area has seen a significant increase in rainfall which has been a challenge keeping the pool algae free.
Rain has nothing to do with why you got algae. Pointless excuses for why the water is green and cloudy.
This past summer has been absolutely the worse in trying to keep the pool water clear due to the onslaught of gypsy moth / caterpillar Fraz which literally bombarded the pool upon opening
Again, pointless excuses for why the water can't stay clear.

I recommend that you get a good test kit and read through all of the available educational information on this site so that you can learn the real science and take control of your pool.
 
+1 Sued. If your water is unsanitary, you aren't adding enough chlorine. There's no two ways about it. A 6 inch whopper of a storm dilutes a 60 inch average depth pool by 10%. If your FC level was so low that 10% swamped you, it's not the rains fault.
:)

And Welcome !!!!!

I'd slam before you close. Our dialy UV loss is about to get a bunch lower and it will be an easier battle than when it was hot out.
 
Your local pool store specialists have no clue what they are doing and they have taught you to rely on their endless excuses and remedies.

Rain has nothing to do with why you got algae. Pointless excuses for why the water is green and cloudy.

Again, pointless excuses for why the water can't stay clear.

I recommend that you get a good test kit and read through all of the available educational information on this site so that you can learn the real science and take control of your pool.
I've been on this forum for the past 15 years but had to create a new User ID due to an email address change. If you read my comment, I've successfully maintained my 40k gallon pool for the past 28 years and have been using a Taylor test kit - and have engaged pool specialists throughout that time as well. My water is not green and cloudy, I have pink algae which is slimy to the touch. Every pool specialist I've spoken to said that this past summer has been particularly challenging due to massive amounts of caterpillar Fraz (poop) for pools in wooded areas. I'm asking for assistance from the community, not condescending remarks. Thank you.
 
Does it feel slimy?

Does it brush off?

Do you have copper in the water?

Can you post a full set of chemistry readings?
Yes, it feels slimy, and it only partially brushes off. No, I don't have copper in the water. I have SLAM'd it twice the past week. Will post pool chemistry readings later today.
 
I have SLAM'd it twice the past week.
To completion ? Passed an OCLT for each ?


Is there excessive FC loss or does it hold well?

What FC do you target and how much does it swing?

(The cya level will be answered when you post test results)
 
+1 Sued. If your water is unsanitary, you aren't adding enough chlorine. There's no two ways about it. A 6 inch whopper of a storm dilutes a 60 inch average depth pool by 10%. If your FC level was so low that 10% swamped you, it's not the rains fault.
:)

And Welcome !!!!!

I'd slam before you close. Our dialy UV loss is about to get a bunch lower and it will be an easier battle than when it was hot out.
Thanks for your help, I've actually been a member for 15 years but had to create a new user ID. Free chlorine has been normal but have been dealing with trying to remove metal stains along the pool walls by using ascorbic acid, algaecide, metal sequestrate process which basically consumes free chlorine. I then slowly raised chlorine levels. This is a process I've use several years which as worked fine. The pink slime appeared after a week of massive torrential rains and flooding in my area.
 

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My water is not green and cloudy, I have pink algae which is slimy to the touch.
Your original post indicates green and cloudy.
Every pool specialist I've spoken to said that this past summer has been particularly challenging due to massive amounts of caterpillar Fraz (poop) for pools in wooded areas.
Pool people blame everything under the sun for algae when they have zero clue.
I'm asking for assistance from the community, not condescending remarks. Thank you.
I apologize if my remarks seem condescending, it is not my intention.

You need to know that most of what you think is true is not true and it is causing your problems.

Over the past few years, our area has seen a significant increase in rainfall which has been a challenge keeping the pool algae free.
Here you say that you have ongoing problems with algae.
This past summer has been absolutely the worse in trying to keep the pool water clear due to the onslaught of gypsy moth / caterpillar Fraz which literally bombarded the pool upon opening.
Here you say that the pool is always cloudy.

Things like rain and caterpillars are not going to cause green and cloudy in a properly maintained pool.

Multiple trips back and forth from the pool store, loaded with shock and baking soda did little to clear up the pool using the SLAM method.
If the pool experts really had any idea what they were doing, then you would not be spending so much money while getting very poor results.

Your pool would be sparkling clean and clear, not cloudy and green.
After the pool is nice and blue but not yet clear, a heavy rain would upset the delicate balance and cause algae growth, resulting in another heavy-duty pool shocking, PH balance... rinse repeat.
Again, poor results from the pool experts advice.
This is the first year I've not been able to see the bottom of the pool but at this point it's not worth the trouble.
Again you say the pool is too cloudy to see the bottom.
 
Could you explain what you mean by this? Because that doesn't sound like you followed the SLAM Process.

Perform the SLAM process:​

  • Test the FC level and add enough chlorine to bring FC up to SLAM level 3-4 times per day.
    • The more often you can test and add FC, the faster your SLAM will proceed. However, you should not test and add more often than every two hours.
    • At the beginning of your SLAM, the chlorine is used quickly to kill algae. As the algae is killed off, you can reduce your testing and chlorine additions to 2-3 times per day.
    • We recommend testing after sunset and at sunrise to check if algae is consuming chlorine in the absence of sunlight (see OCLT).
  • Brush and vacuum the entire pool once a day if you can. Brush inside skimmers, under main drain covers, on weir doors, inside ladders, and behind removable lights if applicable.
  • Backwash or clean the filter when filter PSI increases by 25% over baseline.
  • Vacuum up debris as needed.
  • Run the pump 24/7 until you are done SLAMing.

Finish the SLAM:​

Once all three of these criteria are met, you have completed the SLAM process and can allow the FC to drop to normal levels.

Note: I've followed this process successfully over the past 28 years of pool maintenance.
 
I've been on this forum for the past 15 years
You are not following the advice given here.

You are relying on pool store advice.

If you were following the advice here, you would have posted a full set of chemistry readings as you would know that that is the most critical thing we need to know.

In my opinion, the pink is probably not algae, but I do not know what it is.

Pink algae is a bacteria and it would brush off and chlorine would kill it.

I suspect that the pink is metal staining of some type, most likely copper cyanurate.

Is your test kit FASDPD?
 
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Multiple trips back and forth from the pool store, loaded with shock and baking soda did little to clear up the pool using the SLAM method.
You have to follow the Pool Store advice or the advice given here.
Pool store analyzed water and advised shocking heavily and using algaecide which I've done.
Again, pool store advice and water analysis vs. your own water testing.

We do not recommend algaecide.
They are trying to throw so many chemicals at me that basically has done nothing to mitigate the problem except cost $$$.
Right, that is how they work.
Pool store recommended a product called 'Pink Treat Algicide' that will supposedly wipe out the pink algae but based on my research, many have claimed that the Pink Treat will basically convert the pool into a bromide/bromine pool causing it to no longer hold chlorine. Should I roll the dice and try this product?
Again with the pool store recommendations and products.

After 15 years, how are you asking if we will ok this product?

Get the FASDPD test kit and follow the advice given here and you should have zero problems or keep following the pool store methods and ask them why their process is not working.
 
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In my opinion, the pool is probably coated in fiberglass and the pink is probably copper cyanurate, but I am not sure.

Did you have the pool built or was it there when you bought the house?

Have you ever had the pool resurfaced?
 
Note: I've followed this process successfully over the past 28 years of pool maintenance.
You just copy and pasted straight from the link I provided. You claim to be following said process for longer than it has existed. You already said you've been going to the pool store for "shock and baking soda" which doesn't sound like the SLAM Process in any form. Oh, and you said you followed the process twice in a week, which is rather unlikely given the criteria required to call the process complete.

Somehow I'm skeptical...
 
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You are not following the advice given here.

You are relying on pool store advice.

If you were following the advice here, you would have posted a full set of chemistry readings as you would know that that is the most critical thing we need to know.

In my opinion, the pink is probably not algae, but I do not know what it is.

Pink algae is a bacteria and it would brush off and chlorine would kill it.

I suspect that the pink is metal staining of some type, most likely copper cyanurate.

Is your test kit FASDPD?
I have two test kits: Leslie's Total Pooolcare DPD test kit and for quick chlorine & PH testing I used Taylor's K-100. However, I plan on going to the pool store this evening for a water test and will post chemistry readings by tomorrow. About 50% of the pink algae/slime brushes off. It is pink algae as it's slimy when I used a pool net to pick up the debris on pool's bottom. Here is a closer pic of how it looks on the pool wall.
 

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