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A friend of mine sells the filtration systems to car washes. Not sure about all car washes but every one he knows uses centrifugal systems to remove particulates and yes, they take out just about any solids out of the solution, keeps the sprayers working well so scratching is not your issue.
The water is recycled because it contains all kinds of solvents, gas, oil etc. really whatever washes off the top or underneath dirty cars and trucks. Solids removed but it is still considered a hazardous waste when it is disposed of which is costly so it isn't changed very often. In climates where they use salt on the roads this water contains as much salt as can stay in solution so that is your biggest issue unless there's a desalination plant.
I use carwashes on my daily drivers, cars look great and they drive through salt roads all the time so I'm not too worried. But the P car is asleep all winter, doesn't come out until several soaking rains and the street sweepers take up all the sand in the spring so needless to say it never sees a car wash. Glad car wash operators are also Porsche fans and looking to make them better all the time.
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