Supa Tap Water Crystals is a sodium thiosulphate water conditioner for removing molecular chlorine from your aquarium water.

Water that comes straight from the tap is highly polluted with potentially hazardous chemicals, such as chlorine. These crystals are perfect for setting up your aquarium where water is used straight from the tap, as it cleans and conditions, removing all the dangerous chemicals.

Also, great for using when changing your aquarium water, where again tap water may be used.