with the high cost of deionised water I have been thinking about the "Water to go" system. It is basically a drinking bottle with a very impressive NASA designed filter that takes out virtually everything. Filters are about £15 and are good for 200 litres which works out at 7.5p per litre.
It may be possible to buy the filter without the bottle and rig up 2 vessels for a quicker process :-)
It may be possible to buy the filter without the bottle and rig up 2 vessels for a quicker process :-)