Understanding PSI and GPM Before Hiring a Cleaner
If you are comparing pressure cleaning quotes in Western Sydney, you will quickly notice two technical terms: PSI and GPM. Many contractors list these figures on their equipment specifications, and some use them as selling points. Knowing what they mean helps you judge whether a cleaner is using the right equipment for your driveway, roof, deck or fence, and whether the price you are quoted is fair. What Is PSI? PSI stands for pounds per square inch. It measures th