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Thanks for the clarification.

What would be your recommendation for a cost effective larger-scale solution with higher flow-through rates?

David

Would creating the properly sized RO system result in the ability to rinse the car, let it air dry, and not have any spots? My impression is that the spots are caused by calcium and other minerals...

P.S. I guess I have a related question. The source water that I have can either be straight city water that is hard (12 grains?) or softened water that has gone through my whole house filtration...

That is exactly my thoughts with the replaceable cartridge systems. Low up front costs, followed by disposables that would bankrupt you.

With respect to a system that can be used in a high-ish...

I'm trying to come up with a rational system as well with the same end-point. Looking for spot free car washes.

There are two common commercial products that I've heard of. One is called Mr....