Help with Mysterious Film Above Waterline Damaging Liner Print

[abrk01]

Last year we started noticing a stubborn "film" developing just above the waterline of our pool, especially in the corners. It was very difficult to remove. After opening and cleaning the pool this season, we saw the affected area had spread further.

The biggest concern: when we try to clean it using a microfiber rag and just pool water, it actually removes the printed design from the liner itself. Has anyone experienced this or have any insight into what might be causing it and how to safely resolve it?

Appreciate any help or advice—thanks in advance!

Photos from last year to this year

 

[Mdragger88]

To help solve this mystery….
Can you share your latest test results?
Fc
Cc
Ph
Ta
Ch
Cya
Salt if applicable
What chemicals do you regularly use?
How do you chlorinate your pool?

 

[abrk01]

To help solve this mystery….
Can you share your latest test results?
Fc
Cc
Ph
Ta
Ch
Cya
Salt if applicable
What chemicals do you regularly use?
How do you chlorinate your pool?

Hi of course and thank you for your quick reply:

I have a 24k gallon in ground salt water pool


Fc: 4.89
Cc: 0.20
Ph: 7.4
Ta: 124 (adj 113)
Ch:185
Cya:38
Salt if applicable: 3300
What chemicals do you regularly use? Chlorine free oxidizing shock weekly and regular shock 1x monthly
How do you chlorinate your pool? Salt generator with the above

 

[Mdragger88]

Hi of course and thank you for your quick reply:

I have a 24k gallon in ground salt water pool


Fc: 4.89
Cc: 0.20
Ph: 7.4
Ta: 124 (adj 113)
Ch:185
Cya:38
Salt if applicable: 3300

None of these parameters look particularly suspicious as cause for your issue- aside from that they appear to be pool store tests which can be suspect and unreliable. We do recommend that you test your own pool water with either a Taylor k2006c salt or tf100/pro salt
Test Kits Compared

What chemicals do you regularly use? Chlorine free oxidizing shock weekly

This is generally not necessary in an outdoor pool and has no sanitation properties. It is simply an oxidizer. While Chlorine is both an oxidizer and sanitizer.
Not sure if it may have been a factor in your issue but It can also be quite harsh for people. It contains sulfates which can build up and harm your swcg and your heater if you have one. It can also show up as cc’s when testing unless an interference reagent is used.
For all these reasons mps (non chlorine shock) is not recommended for use in outdoor pools.

and regular shock 1x monthly

What product is this? Can you share a pic of the label or name of the product.
Prophylactic “shocks” are unnecessary in a properly maintained pool that always has adequate sanitizer.
See —>FC/CYA Levels

How do you chlorinate your pool? Salt generator with the above

Great

Have a look through these links to get an idea of how TFPC works and what we recommend
Pool Care Basics

Recommended Pool Chemicals

Which should I buy? TFP's recommended pool chemicals are cheap, easy, and won't unbalance your pool water.

www.google.com

Non-Recommended Pool Chemicals

These pool chemicals should not be added to your pool. Save your money and frustration and avoid these chemicals!

www.google.com

 

[JamesW]

It might be the liner peeling.

Contact the liner manufacturer to see what they say.

 

[duraleigh]

Yeah, if the color is being removed simply by cleaning with a cloth, something is faulty about the liner.

I don't see how you can stop it. I wou8ld see if you can get liner maker involved.

 

[Mdragger88]

The liner as a whole does look quite faded compared to the previous year’s pictures.

 

[Newdude]

Nobody asked me, but imma blab about it anyway.

The definition of shock is a sudden, often violent change.

If you need to shock the pool, its because you didnt use enough chlorine in the first place. Ironically, everyone has no problems adding it in dump and pray mode to overcorrect, but they are super stingy in the first place. So just add it in the first dang place, on your terms, not the algae's. Especially with a SWG, you aren't even doing anything. Just set it a little higher than you need and everything will be hands off.