It was less of an insult, and more of a tip. Everyone has a busy lifestyle, some more so than others, but it’s mostly relative. When you dont search, you are causing other people with busy lifestyles to spend time answering questions that have already been answered many times. Also, it’s not like a pump is leaking and you need speedy answers. You are asking a pretty generic broad question, so that stuff can be searched for when you have some down time. Like now.
That being said, i understand where you are coming from.
GPM is much more important than PSI, especially for residential. Minimum GPM is considered 4GPM, however 5.5 GPM is highly preferred, and 8 GPM is pretty much the best.
If you go higher than 4GPM, you will likely exceed the output of most residential homes, and will require a buffer tank. Belt drive or gear drive will pull from a buffer tank a lot better than a direct drive will. Some people can pull with a direct drive, others cant… depends on gravity sometimes.
Google downstreaming, that is the preferred method of application for house washes.
If you want to clean driveways/sidewalks/concrete, you will need a surface cleaner. That is the only time PSI comes into play, but with residential you still wont need that much compared to commercial. Any 4gpm machine should put out sufficient PSI for that.
You generally use bleach, water, and a surfactant (soap) to clean. Sodium Hypochlorite is the chemical name for bleach, and you can buy it in bulk at 12.5% concentrations, or by the gallon from grocery stores at 8-10% concentrations. There are specialized soaps, but you can get by with liquid dishsoap, like Gain. There are more chemicals for specific things, but thats a start for you.
P.S. - This isn’t a safe space message board. You got to have thick skin, especially if you ask ding dong questions. It’s worth it, though.
