Algae Stain on Vinyl Pool

[Anon1mous]

Ok, my pool is balanced and looking good. I still have old algae stains on my vinyl liner; walls and floor.
I did the Vitamin C test by putting a pill on it and it removed the stain.
I am looking on Amazon for a powder that will do the job to remove the rest of the stains.
1) I found this Citric Acid- Will this do the job? Amazon.com: Citric Acid (1 Gallon) for Cooking & Cleaning, Natural & Food Safe, Highest Quality, Non-GMO, Chemical Free, Resealable Bucket by Unpretentious Baker: Health & Personal Care

2) Is there a difference between Vitamin C vs Citric Acid?

Amazon.com: Earthborn Elements Vitamin C Powder (L-Ascorbic Acid) Antioxidant, Resealable Bucket (1 Gallon): Health & Personal Care

Buy Earthborn Elements Vitamin C Powder (L-Ascorbic Acid) Antioxidant, Resealable Bucket (1 Gallon) on Amazon.com ✓ FREE SHIPPING on qualified orders

www.amazon.com

3) I have a 30,000 gallon pool. How much do I need to put in?

4) Does the filter stay on or off during the treatment? If either way, for how long?

Thanks!

 

[mknauss]

That is not algae, that is iron.

Best to wait until late in the year when the water is cold.

Ascorbic Acid Treatment - Further Reading

www.troublefreepool.com

 

[Anon1mous]

so there is nothing to do now? I was hopping to get this resolved before swimming season.

Regardless, which product should be used? What about filter status? etc

NM....just saw your article above