Has anyone heard about using ferrates for water treatment? This company seems to have some interesting technology. The patent claims that it can be used for treating swimming pool water.
The device of the present invention can be fitted to any swimming pool or Jacuzzi such that the ferrate produced by the device is mixed with the water in a mixing chamber, whereby all the organic waste is oxidized to innocuous products, the iron salts are filtered away, and the clean water is re-introduced into the pool. This represents a highly effective and cost-efficient method of cleaning the pool water, since ferrate produced by the methods of the present invention is less costly in the long run than purchasing the numerous oxidants and anti-fungal chemicals necessary to treat a pool.
http://patft.uspto.gov/netacgi/nph-Pars ... e+AND+daly