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1. PSI and GPM Ratings Look for models with a PSI (pounds per square inch) rating between 1200-2000 for safe and effective car washing. A higher PSI might be too aggressive and could damage the paint. The GPM (gallons per minute) indicates how much water the unit can deliver; a higher GPM leads to better cleaning efficiency.
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Most commercial car wash machines typically operate at pressures ranging from 1,200 to 3,000 PSI (pounds per square inch). A pressure of 1,200 PSI is adequate for gentle cleaning and is often used for delicate surfaces or vehicles that only require light washing. In contrast, pressures exceeding 2,500 PSI are suitable for heavy-duty cleaning, making them ideal for trucks, SUVs, or vehicles that frequently traverse muddy terrains.
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