I think i got a solution to make a very high purity water filter
i will post my idea here
it consists of two tanks of water connected to each other by a polimer filter those to make deionized water... than insert a very large surface electrode to the inside of the each tank. Than apply electric field to make the ions flow thru the filter,
the filter basically is a tube filled with this small plastic balls.. this capture the dirt ;;;;
i guess that ac oscillating at VLF could also work maybe some milihertz
