Instead of derailing another semi-related car washing thread, I figured I'd create a new one for this topic, specifically. I'm going to take a stab at a DYI "spot free" filtration setup for my car washing. There are several "purpose built" de-ionozation/filtration systems out there, but they are expensive ($350+). This DIY kit won't DI the water, but should at least filter sediments, calcium, chlorine, etc...and in theory, it should at least improve my water spotting situation. I figure for ~$50 it's worth a shot. The last time I washed my car, it had started drying (water spotting) before I could even get the car halfway dried. I use a leaf blower to dry my car due to the soft Subaru clearcoat that seems to scratch/swirl/haze if you even look at it the wrong way. Besides, the leaf blower gets the water out of all the jams, grill, mirrors, and such to minimize excess water drippage. I'm sure my neighbors are annoyed by it and think I'm crazy, but it works great, especially on a freshly waxed car. Here's a thread describing basically what I'm looking to throw together: http://www.moddedmustangs.com/forum...sh-diy-screw-you-mr-clean-i-ll-do-myself.html Thoughts? Anyone currently using their own DIY filter/spot free setup similar to this one?