Potassium permanganate is a chemical solution that is sometimes used to treat odors, the taste of chlorine, and bacteria growth in tap water. If potassium permanganate is present in high quantities, it can turn the water a pinkish color and can stain solids a dark pink color as well. If you have spilled potassium permanganate on yourself, the floor or simply do not want your water to be pink anymore, you can treat it through a fairly easy process.
Treat your water supply by installing a water-treatment filter filled with sodium metabisulfite at the main water intake for your home. This will effectively neutralize the potassium permanganate as the water passes through the filter. Locate the main shut-off valve for your water supply and turn the valve to the "Off" position. Use the crescent wrench to unscrew the coupling between the shut-off valve and the rest of your plumbing.
Screw the water-treatment filter into the pipe leading to your home and make sure the treatment reservoir is situated at the top of the filter. Screw the intake pipe into the other side of the treatment filter and turn the water valve back to the "On" position.
Fill the treatment reservoir with the powdered Sodium metabisulfide and screw the top of the reservoir on tight. Turn the water on at various positions within the house and test the color. Adjust the treatment knob at the base of the reservoir until the water coming out of your water fixtures is clear and free of coloration.
Mix a solution of two parts water to one part Sodium metabisulfite and fill the spray bottle with it. Use a sponge and this solution to clean tubs, sinks and other areas that have been stained by the potassium permanganate in your water.