Colour your swimming pool green temporarily. Whether You are looking for new party trick for your next St. Patrick’s Day celebration or simply want to turn your swimming pool into a magical green wonderland, the Aqua Pro Water Changing Colour Green is for you. The Aqua Pro professional range is a temporary, non-toxic and non-corrosive dye that does not affect the chemistry of your water. This product is safe, non-staining, and won’t leave residue on swimmers. Two applications of the dye are suitable for a pool of 50 000 litres and will last approximately 2-3 days. To undo the colouring process, simply add a cup or two of granular chlorine into your pool water and the colour will dissolve, leaving your pool clean and sparkling again.