It's a .5 micron carbon filter, I had found a guy that was having similar problems with spots on his charter boat. I'll try and find the link. The whole set up costs around $100
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Ag76 I had similar issue, I added an inline water filter to my outside hose with a .5 micron filter. Solved 90% of problem.
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Unfortunately the truck is too long for the garage, for some reason where I live in Florida garages have the a/c, water heater and washer/dryer.
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