Water goes green for 2 days-ish after adding liquid chlorine.

[NyDon]

Hello yall,

I am running into a new issue for me. Water will be crystal clear, then I add liquid chlorine and it goes green, overnight, for a day or two.

Maybe a copper issue? It is not a new pool. It has never done this before.

Any advice is appreciated.

20' x 60' inground vinyl lined
39,000 gallons
Filled with well water
Alkalinity at 80
Ph'ed to 7.2


Don

 

[YippeeSkippy]

How often do you add chlorine?
How much do you add?
What is your CYA level?
How do you test your chem levels?
Have you ever had your well water tested for iron, and other metals?

Maddie

 

[NyDon]

How often do you add chlorine?
How much do you add?
What is your CYA level?
How do you test your chem levels?
Have you ever had your well water tested for iron, and other metals?

Maddie

I add chlorine as needed. I test daily, FAS-DPD.
CYA at 40
I test with the supplies in my TF-100 kit. Except ph. For that I use an Apera ph-60.

I add chemicals as the TFP pool math app tells me.

I have not had my water tested.

 

[YippeeSkippy]

Hmmm.. the only thing I can think of is either your well water suddenly developed a metals problem, or you're not adding chlorine in a timely fashion and algae is taking up housekeeping?

Chlorine needs to be added daily to maintain an efficient sanitation level, not allowing it to go down too low before adding it again.

I wonder if you need to perform an Overnight Chlorine Loss Test to rule out algae --> Overnight Chlorine Loss Test

Maddie

 

[duraleigh]

Your description indicates iron in your pool water.

The chlorine you add temporarily changes the pH of your pool and the iron precipitates out as yellowish particles. The blue pool water combines with the yellowish particles and the result is green. It goes away in a day or two because the pH returns to normal and the iron turns back into solution (but stays in your pool)

The cure? have your well water tested for iron to confirm what we are thinking.......it probably wont be much at all but it has steadily concentrated over the years in your pool. Once confirmed put enough dose of chlorine into the pool to make it turn green again and then, using polyfill in the skimmers, filter our as much yellowish iron as you can. This will probably reduce the number of occurrences.

Another way is drain and refill but, remember, your refill water still has iron in it and you have diluted it temporarily so it will eventually happen again.

The best solution is if you have a whole house water softener (for iron) you can use that as your refill source and eventually get to an iron free pool

 

[YippeeSkippy]

If it is iron that your pool has allow the pool to get and keep as much rain water as possible and you'll be able to lower your well water ratio a bit. If you know you're in line for a Nor'easter, lower the pool an inch or two and let the rain refill it.
Snow is useful too.

 

[NyDon]

Your description indicates iron in your pool water.

The chlorine you add temporarily changes the pH of your pool and the iron precipitates out as yellowish particles. The blue pool water combines with the yellowish particles and the result is green. It goes away in a day or two because the pH returns to normal and the iron turns back into solution (but stays in your pool)

The cure? have your well water tested for iron to confirm what we are thinking.......it probably wont be much at all but it has steadily concentrated over the years in your pool. Once confirmed put enough dose of chlorine into the pool to make it turn green again and then, using polyfill in the skimmers, filter our as much yellowish iron as you can. This will probably reduce the number of occurrences.

Another way is drain and refill but, remember, your refill water still has iron in it and you have diluted it temporarily so it will eventually happen again.

The best solution is if you have a whole house water softener (for iron) you can use that as your refill source and eventually get to an iron free pool

Is this an acceptable product?

https://www.amazon.com/Fairfield-Original-Poly-Fil-Premium-White/dp/B08L7FPQKX/ref=mp_s_a_1_6?crid=1TS78VGO2T9KU&keywords=polyfil+for+pool&qid=1656199929&sprefix=polyfil+for+pool%2Caps%2C216&sr=8-6&ufe=app_do%3Aamzn1.fos.d977788f-1483-4f76-90a3-786e4cdc8f10

 

[duraleigh]

That's awfully big. Can you find less quantity?

 

[NyDon]

That's awfully big. Can you find less quantity?

Yes. I just searched Amazon. Wasn't sure if that was the right stuff, there seems to be different forms of it. That stuff is like stuffed animal stuffing.

 

[Deb04]

That's the type of stuff. You can also get a much smaller quantity at Michaels.

 

[NyDon]

That's the type of stuff. You can also get a much smaller quantity at Michaels.

Thanks. How much do I put in my skimmers? Of which I have 3.

 

[Snoobug]

I bought that same box of polyfil off amazon last year. I have so much left. Also not sure if I missed it but skimmer socks help too. I liked putting the skimmer sock on then adding polyfil to the basket.

 

[Snoobug]

I went back to my old thread to see the skimmer sock/polyfil pic when I had iron issues.

 

[duraleigh]

Any clean white cloth would work, too. Old cotton t-shirts, etc. Something that would allow the iron particles to grab onto