My experience is that the stains will go away by themselves, through the effects of the chlorination of the water. Does not matter if the pool is a salt pool or fresh water pool. If the pool has a plaster finish, brushing the stains with a wire pool brush will speed up the process.
Scrub it down with fresh water and a stiff broom or brush
I have a fiberglass pool and I am constantly battling with iron stains. It is not impossible to remove the stains. I get brown stains in my pool and I treat them with jacks magic stain solution #1. Check out their website. They show different pictures of different types of stains. The stuff does remove the stains quickly, but it is expensive. Hope this helps.
I was told to just super chlorinate the water. You may have to repeat with the super chlorination, but over time, stains should fade away.
Use a 10% solution of pool acid and wash with water
Bleach might do it. Also investigate the cause of the stains by observing pool users.
Brown stains can be removed by doing a shock treatment for the pool and then scrubbing the stain. Enzyme based pool chemicals will also remove brown stains.
Drain pool and clean with muriatic acid
quit pooping in it
What is the best way to remove algae stains from the pool liner? Empty the pool, use a soft brush, mild detergent and water to remove algae stains from the pool liner. Thoroughly rinse and dry before refilling or storage. More pool ? http://www.intexstore.com/FAQGeneral.aspx http://www.air-inflatablepools.com
Since you cannot remove the "stains" with the methods you have tried perhaps the stains are from too much acid or high acid levels. Are there also copper colored stains as well? Do you have a pool heater in the system? If so, then it is copper stains from an acidic pool water. The over acid conditions are stripping the copper from the heater copper tubing. k
cause you haven't cleaned your pool in a long time