This is another water filtration system that is significantly more economical than the CRspotless. I have no idea as to the relative performance, however.
As for mitts/microfiber, I bought a $hitload of stuff from www.autogeek.net
-- I like the MF mitts, waffle towels, etc. I am a Zaino guy so I have Zaino wash soap, two of the Zaino wash buckets with grit guards, etc.