Due to the ion exchange properties of Zeolites, their applications in water treatment are numerous. The best known example of the Zeolites use is water softening, mainly in detergents and soaps. The strong ion exchange properties even allow Zeolites to remove radioactive ions from contaminated water (a recent example is Fukushima, Japan) or nuclear waste. Zeolites can also be used for water filtration, heavy metal (such as arsenic) removal or ammonia removal from fish pond.