A method and apparatus for removing ionic and suspended particulate impurities from a liquid by directing the liquid through a bed including a mixture of ion exchange fibers and inert fibers. The bed also may include a mixture of finely ion exchange particles. The bed may be a precoat layer that is applied...http://www.google.com.au/patents/US5346624?utm_source=gb-gplus-sharePatent US5346624 - Method and apparatus for treatment of aqueous solutions
