Well now that I've had my CR spotless DI for a few months I figured I would share my practical observations and experiences..

Because of the cost of resin, I started out doing everything i could to conserve the water flow..

My original wash procedure was:

1) wash car and wheels with unprocessed tap water (including both buckets of my two bucket regimine)
2) Only perform final rinse using CR Spotless and using a Pressure washer to reduce filtered DI water (and thus extend resin life).
3) Dry using Airmax

What I found however was:

1) I saved a lot of Resin and got manny washes out of it
2) I had a hard time getting to the final CR rinse in time (especially in typical So Cal sunny days).. So I ended up constantly fighting spots..
3) Using the pressure washer with CR on final rinse only, since there is a lower water flow I found it difficult to always get all of the "unfiltered" water off the car. No matter how hard I tried I always ended up with areas where there was residual tap water that didn't get rinsed off and spots occurred. Or something ran from a hidden spot


So.. what I'm finding out works much better is to a) ditch the pressure washer on the final rinse or b) both wash and rinse using CR with pressure washer. And in reality a) seems to be quickest and easiest.

By washing and rinsing with CR/DI I've finally eliminated the spots . Also I find that washing/rinsing the wheels with CR I get less spots on the rims as well.

I suppose this is at the cost of more frequent resin changes, but in reality using the hose nozzle setting (flat) it seems to conserve the water pretty well anyway. Additionally I found a source of resin that is much cheaper than CR so that takes the sting out a bit..

So the moral I learned is that by being too concerned (i.e. cheap) with the CR I ended up defeating my original intent for getting the CR in the first place (Spotless)..