Any of you guy's heard about this, I'm thinking of picking up one. The product is Called Aqua Gleam and they come in 0 PPM or 30 PPM filtration. I figure it's a lot easier then dragging a CR spotless, however the down side is they don't recommend you use it a pressure washer. Product link. Aqua Gleam De-ionising Water Filter 12" 30ppm | Spot Free Car Wash
They don't give much information on the unit, but this looks like a unit where you recharge it using a bucket of water softening salt. I can't find replacement/refill cartridges on the site which is why I'm drawing this conclusion.
I am curious about this unit: Spot Free Water Filter You attach it to the END of your garden hose, seems to have a fairly similar profile to the Aqua Gleam, and they include a 20 foot hose that you attach any standard hose nozzle to. Includes a bypass valve for choosing DI water or tap water so you don't have to waste the filter if you don't want to. Refill cartridges are only $35 but it only lasts approximately 40 gallons depending on water quality. That's about $1 per gallon of water. CR Spotless can provide up to 4 gallons of DI water per $1 if you buy the 1 Cubic Foot Resin Replacements ($215 good for 3 complete refills). That's approximately 900 gallons for $215 so a CR Spotless is more $$$ up front but is much cheaper with filter replacements and you CAN use your pressure washer with it.
Don't get confused if it's a deionizer that is completely different from a water softener. This appears to be a deionizer and trying to regen with salt will be an absolute futile effort. If you can take the Aqua Gleem apart then you would just empty out the mixed bed of resin and replace with new resins just like you do on the CR. This is the same concept just on a much much smaller scale. Would probably be a decent alternative for someone just keeping up their own car. Also I do have an issue with their claim that 30 ppm water will leave a spot free rinse. CR tells you to replace resins when it starts to read 20-25 ppm. That 30 ppm one will start off at that.