If your tap water is 20ppm, I doubt you'll need filters.... although I could be corrected on this. You'll definitely need a Deionising vessel to polish off the water to pure, after the tank you'll need a 100psi pump, Shurflo are good, about £100 with VAT, and a Varistream pump controller to regulate the pump speed. These are about £80 I think.
100 meters of microbore on a sturdy metal hose reel, and a good, lightweight pole. 21 foot will be fine for most domestic, but if you want to start taking on commercial work then budget for a longer, lighter pole for later on.
Oh, and some garden hose and hoselock connectors to connect it all together in your van

Have a look at these sites....
www.wintecs.co.ukwww.purefreedom.co.ukwww.gardinerpolesystems.co.ukI've dealt with all of them, and they are all brilliant
