http://www.ebay.co.uk/itm/Water-Genie-Pro-Lite-500L-Window-Cleaning-System-WFP-Water-Fed-/350865530568?pt=UK_HomeGarden_CLV_Cleaning_CA&hash=item51b1371ec8It is a very basic system. Its a standard plastic tank with a steel frame around it. The photo taken for the ebay picture already shows rust at the bottom of the frame where is hasn't been painted properly. The colour blue will make it difficult to see the water level but I maybe wrong as I have a 'clear' tank. There doesn't seem to be any water shutoff system when the tank is full, so expect flooding of your van if you forget the r/o is on.
The controller seems to be a very basic 'DIY' type that is sold on Ebay and just reduces the pump flow but relies on the pumps pressure switch. I don't recognise the pump. But a good controller and pump can be purchased from Ebay for around £200 or a little more if these don't last.
The r/o unit is a 4040 but the prefilter is the minimum you can buy. Although you can fit a replacement Fiberdyne sediment and chlorine combination filter, my personal preference is for a separate sediment and chlorine block filter, especially if your water is sediment laden like ours is.
You have the choice of HF4 or HF5 membranes for the r/o depending on your water pressure. As the HF5 is more expensive, we can guess that they have fitted an HF4 which is for higher water pressure.
The DI vessel is also very small and you will probably have to upgrade it, especially if you are in a hard water area.
Whilst price seems to be the attraction here, I would look at a more expensive unit TBH. Purefreedom make a good range and the frame is (use to be) made from stainless steel, they have 2 prefilters, you can upgrade to a HF5 membrane if your water pressure is low, and they use top end controllers and pumps.
The other option is to talk to Doug at
www.daqua.co.uk and tell him exactly what you are looking for and ask him for a price.