Do I use Yellow Out?

[Chdalm]

Moved from here.
Hello, my pool wall and floor is getting mustard spots and it is not possible to get rid of the stains. My FC is around 6, CYA over 140, PH 7.6, AKA around 120. I am thinking to buy this product. Is this product will clean the stains? My water is very crystalline. It is getting worse the color of the walls and floor. Thank you

 

[mknauss]

Nearly all Yellow Out type products are Sodium Bromide. If you add that to your pool, your pool becomes a Bromine pool. And is very difficult to manage from that point forward. Please do not use the potions for algae. Simply follow the SLAM Process

 

[Donldson]

My FC is around 6, CYA over 140

This is why you are having this problem. You need to bring this down to a more reasonable level and follow the FC/CYA Levels (after successfully performing the SLAM Process ) and this problem will cease. Right now your FC should never be allowed to drop below 10 ppm. Since your FC is below 10, you have algae. There's no secret, no mysterious thing happening, you just don't have enough chlorine in your pool to prevent algae with that level of CYA.

 

[Chdalm]

I will try to drain a little and fill with new water. And do the slam. Right now without draining the pool. Do I have to use 2 gallons of bleach as pool math indicate?

 

[mknauss]

You need to enter your test data into Poolmath. Your SLAM level FC for a 140 CYA is 60 ppm.

 

[YippeeSkippy]

Where is Conroe?? Can you please add your state/province to your details. Thanks. Knowing your local climate helps us guide our answers.

 

[Chdalm]

Zip 77384 already update my profile. Thank you.

 

[Chdalm]

You need to enter your test data into Poolmath. Your SLAM level FC for a 140 CYA is 60 ppm.

It will be 14 gallons..it is better to drain..

 

[Chdalm]

I think the last owner put too much chlor brite in the pool and raised the cya to the sky. Am I right? When I purchased the house he left 4 bags of it.

 

[Newdude]

will try to drain a little and fill with new water.

Just wanted to make sure you understood the math. To get to 30 CYA from 140 is a 78.5% drain. That is a heckuvalot more than a little. It can be done in stages but the water keeps mixing and you don’t get 5 X 10% = 50% lower CYA. You get 10% of the first drain - 10% of the new number - 10% of that #, Etc and it’s less CYA drop each drain proportionality. You will waste more water doing it in multiple drains but sometimes it needs to be that way.

 

[magiteck]

I think the last owner put too much chlor brite in the pool and raised the cya to the sky. Am I right? When I purchased the house he left 4 bags of it.

Looks like Chlor Brite is Dichlor, which adds almost equal parts chlorine and CYA to the water. So that's a very likely cause.

 

[Chdalm]

Thanks all. I will drain 80% and check the cya after I fill it. I hope this fix my problem. Having the right cya number everything will be easy and less money with shocks. Right?

 

[mknauss]

Right?

Yes. But 'shock' is not really a thing. With proper CYA, you can maintain a proper FC. Or you can follow the SLAM Process if needed.

 

[Chdalm]

Yes. But 'shock' is not really a thing. With proper CYA, you can maintain a proper FC. Or you can follow the SLAM Process if needed.

With empty pool do I need to do something with the wall and floor pool or just leave it and fill with clean water and after testing add the necessary chemicals to find the balance? The stain will get out automatically after the pool is balanced?

 

[mknauss]

Did you empty the pool?

 

[Chdalm]

Did you empty the pool?

Still in progress. It will take around 15 hours if my calculations is right. 1, 080 gallons per hour. Photo attached.

 

[mknauss]

There are risks in draining a pool.
Read Draining - Further Reading

 

[Chdalm]

Everything went well. I kept the plaste walls wet all the time when filling it and it was not too hot, the trees help as well. I am going to test the CYA and others Monday morning and will post. Thank you.

 

[Chdalm]

Hello,
Finally everything is well. Today I tested and follow the results.
FC 7.5, TA 180, CH 170, CC 0, PH 8, CYA 50. I am using chlorinator and put 2. I attached some photos. What is next?.
Ps I purchased some HEB chlorine just in case. The old owner left a bottle of hardness control. The water is not crystalline yet. Have a good day to all.

 

[mknauss]

You show your CYA at 50. You should be using only liquid chlorine for your chlorinating needs. If you return to using pucks, you will have the same issue again.