There is much logic to this, a few sites on the web say there is much success to be had, but they're also the same sites that are selling H20 that is 'pure'.. the upside.. if it works - cut down on nute costs (even if home-brew) & nothing really 'invested' other than a crop cycle of time and more water. Downside: If it produces lower yield, you still have the same electricity bill.