I see ..
Have you got any details on the filtration part of the system ? especially what size it filters down to... microns ... would appreciate anything u have.
I put the bins into a fibreglass insert in the back of my van (Citroen Relay) - it fits two side by side. The water tank is under the bins.
Water runs from the pressure washer out of the bins and through a rough wire screen. This catches all the 'big bits' (nappies, condoms, used tampon applicators, syringes, crack pipes etc) which are usually stuck to the side of the bin. Strained water goes straight back into tank.
Pressure washer inlet is a hose with a nylon lantern filter on it (400 micron). This used to get clogged very quickly so I added a cylindrical wire mesh over it (about 8" diameter by 2ft long which I cover with the leg off an old pair of tights (not mine - they'd be too big
). This gets rid of 95% of fine particles and because the filter is large it doesn't get clogged. Cover the rough edges of the wire filter with tape before you put the tights on it to avoid 'laddering' them.
This then runs to a 100 micron glass bowl filter which is in a handy place for me to keep and eye on it and clean it out when needed (usually about 50 bins). There is a final Y intake 100 micron mesh strainer which I clean about once a month - hardly anything in it as the glass bowl has already taken the 100 micron particles out.
In spite of this you are always running the pump on dirty water as anything less than 100 microns gets through. So as time goes by you will need a new pump - it's not like jetting with fresh tapwater. Friend of mine has designed his with 800 litre clean water tank and then a 600 litre dirty water tank so no need for filtration, but you need a much bigger van
All filters available from Exchange Engineering in Grantham - phone them and they'll send you a catalogue - 01476 578505 - very cheap. Hope this helps.