FadeToBlack is right,

I too am not so impressed by the Mr. Clean system. My black supercab has some spotty issues, but then again, its better than trying it the 'old fashioned' way and cursing my water.

And the problem people have isn't water pressure. You could have 120 psi, and still not be able to reach up high, the filters only allow water to pass through at a certain rate... though if you only had say..3psi (your wife/girlfriend/goldfish would be screaming for you to move or call a plumber...showers would take 3 hours) then there might be a problem...
but generally that tiny a@@#d filter can't handle but so much water.

In my profesional opinion I think its a sham. They demand you use thier soap, which has a drying agent. The filter does remove a bunch of junk, but if you believe that a filter the size of a tube of JB weld will "deionize" your water in milli seconds...I'm preaching, sorry.

I do think they did not design it to work on Black full size trucks. I used the "trial soap, and filter" up with one wash, not 3.

H2O 4 LIFE