Read more In The Swim Stain Away Pool Stain Remover In The Swim Stain Away Pool Stain Remover prevents and removes mineral stains caused by iron, copper, and magnesium. It also prevents the build-up of scale around the water line and in the plumbing. When minerals oxidize, they discolor. After discoloration, they can leave a stain if the mineral settles on the interior. Iron will become red-brown; copper will turn purple-black; and magnesium is pink-purple. Stain away is a must for areas with heavy iron and/or copper content or well water. Initial Dosage: 15 oz. per 10,000 gallons. A double dose is suggested for stubborn stains. In the Swim Stain Away Pool Stain Remover is applied directly to the pool water at a rate of 15 oz. per 10,000 gallons while the pool circulation system is running. Allow the pool to circulate for 3 - 4 hours. Regular brushing is suggested and encouraged. We suggest a double dose for stubborn stains and scale. Active Ingredient: Hydroxyethylidene Diphosphonic Acid (HEDP) 13 - 15%. Best Defense Against Mineral Stains Stain Away chelates copper and iron Suggest for use with well water Safe in all pool surface types Active Ingredient: Hydroxyethylidene Diphosphonic Acid (HEDP) 13 - 15% Initial Dosage: 15 oz. per 10,000 gallons Read more In The Swim's Recommended Pool Care Prevention As a pool owner the prevention of stains may be something you already do. A pool’s normal maintenance (vacuuming, brushing, and skimming the water’s surface) is considered stain prevention. By doing this weekly, you are actively preventing organic stains. In the event that you are dealing with mineral stains, a sequestering agent or chelating agent like In The Swim Pool Stain Away Stain Preventer, used weekly would be suggesting to prevent stains along with normal weekly pool maintenance. Identification If organic or mineral stain does appear, there are a couple of different ways to identify a stain. The most common way is by color. Non-living organics will leave either a green or brown stain on the interior. When minerals oxidize and change color such as iron, it will leave a red/brown colored stain, Copper will leave a purple/black stain, and magnesium will leave a pink/purple colored stain. Now that you know what the stain could potentially be, test the stain. If you think it is organic, use a rubber glove and rub a chlorine tablet against it. It's organic if it comes off or gets lighter. If you think the stain is mineral, use a rubber glove and rub a chewable vitamin C tablet against it. It's a mineral stain if the stain come off or is lighter. Removal The stain has been identified as either organic or mineral. Now is the time for treatment of the stains. In the event that you are dealing with an organic stain, super chlorinate using In The Swim Super Pool Shock and brush as often as possible. The more you brush and work the highly chlorinated pool water into the surface the better. In the event that you are dealing with a mineral stain, use In The Swim E-Z Pool Stain Remover and brush as often as possible. The more you brush the better the product works. Read more FAQ's Q: Does Stain Away prevent or remove pool stains? A: In The Swim Pool Stain Away Pool Stain Remover prevents and removes mineral stains on pool interior surfaces. Q: How much Stain Away Pool Stain Remover is recommended? A: Initial Dose: 15 oz. per 10,000 gallons. Q: What type of pool stain will this help prevent? A: Stain Away will prevent and remove mineral staining caused by iron, copper, and magnesium. It also prevents scale build-up. Q: I have well water in my pool. Should I use this product? A: Yes. In The Swim Pool Stain Away is suggested for well water as a weekly treatment to prevent mineral stains.