LoChlor Multi Stain remover is a triple action, all-purpose stain remover. This stain remover is your go-to for all metallic and organic stains in your spa or pool. LoChlor Multi Stain Remover Benefits and Features - Size: 1Kg Removes iron, copper, manganese, and rust stains. Also removes organic stains such as algae stains, leaf stains, and mold in vinyl liners. Use as an all-over treatment for stain removal or as a spot treatment. Can be used as a stain preventative. How to use LoChlor Multi Stain Remover - Dosage: 1Kg treats 50,000L Adjust pH down to 7 and make sure the chlorine is lower than 1ppm for best results. Avoid applying Multi-Stain Remover directly to a vinyl liner or painted surface as damage may result to the pool surface. For vinyl liner spot treatment, place Multi-Stain Remover in a sock, attach to the telescopic pole and suspend over the stained area. For stains throughout a vinyl liner pool, dissolve Multi-Stain Remover in a bucket of water and pour it around the perimeter of the pool. After treatment a reduction in pH and/or total alkalinity may occur. If adding a pH adjuster (sodium bicarbonate) then do so very, very slowly. (Raising the pH and/or total alkalinity too quickly can cause a cloudy pool as well as re-depositing the stain back on the pool surface) Be aware that high levels of chlorine will reduce the effectiveness of Multi-Stain Remover. Ideally, reduce the chlorine level to zero before using this product. When purchasing, tap the edit cart link to see what freight you pay