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MULTI-STAIN REMOVER, removes metal marks (Copper, Iron, Manganese etc.) on the walls and on the bottom of all types of swimming pools. Operating instructions 1.- Dosage: 1kg for each 50,000 litres of water. 2.- The product should be added directly to the soiled area or distributed onto the surface. 3.- Caution: If there are stains on coloured marble surfaces, on the bottoms of swimming pools or on printed vinyl liners, do not add the product directly onto the stains. In these cases, it is recommended that the product is placed in a sock attached to a telescopic pole and held near the stained area. 4.- Once the treatment is completed, correct the pH and alkalinity of water. Remarks: 1.- Often, stains in pools are caused by an improper balance of pH and alkalinity of water. 2.- This product contains acids that after its application will reduce the pH and alkalinity of water. 3.- For best results, use NO MORE METAL straightaway. 4.- Occasionally, stain removal can cause the water to cloud.