BioGuard Erase Iron Stain Remover is specifically formulated to combat iron-based stains, restoring your pool surfaces to their former beauty. Its proprietary granular formula can be added directly to pool water over the trouble areas, and is compatible with plaster, tile, and vinyl surfaces to accommodate virtually all pools. It can even be used to remove cobalt staining on fiberglass pools! Best of all, Erase Iron Stain Remover is made by BioGuard, an industry leader for decades, allowing you to buy with confidence. Product Dosage 2 lb per 12,000 gallons of water. Directions Pre-Treatment: If your swimming pool is equipped with a heater, first turn the heater off, then isolate from the circulation system. In order to prevent damage to your swimming pool, do not allow un-dissolved particles to sit on surfaces for more than 30 seconds. Adjust the chlorine/bromine residual to less than 1 ppm (for Softswim pools, a B residual of 30 to 50 ppm). Adjust pH to between 7.0 to 7.4. Adjust alkalinity to between 125 to 150 ppm (or 80 to 150 ppm if using a salt generator). Adjust calcium hardness to less than 400 ppm. Stain Treatment: Wearing safety glasses/goggles and with the circulation pump running, add 2 lbs of Iron Stain Remover per 12,000 gallons of pool water. Add the product along the edges of your pool for even distribution. If stains are concentrated in any one area, apply product over it. Use a surface compatible brush to disperse any un-dissolved particles. Allow water to circulate for 1 hour, then apply the correct dosage of Pool Magnet Plus (or Softswim Stain Control for Softswim pools) per label directions. Allow pool to circulate water for 24 hours. Apply Sparkle Up (or Softswim Filter Aid for Softswim pools) from filter by backwashing or cleaning cartridges. Apply BioGuard Kleen It (or Softswim Filter Cleaner for Softswim pools) according to label directions to remove any trapped metals in the filter itself. Complete stain removal may take up to two wee