PSI for concrete cleaning

Tony Shelton

Tony Shelton

BS Detector, Esquire
Okay, we've tried this a few times now and I can't tell the difference between the actual cleaning ability of Chris' 6 gpm 3000 psi unit and my 5.5 gpm 1500 psi unit using the exact same surface cleaner. (we've tried two)

The only difference is we have to walk a very little bit slower my machine.

Does anybody have any idea how low in psi you can go before it starts making a difference?

Here's the thing, to run his it requires a 20 hp gas guzzling motor. Mine is running on 11ph gas sipper. That can make a lot of difference if you've got multiple rigs running.
 
How dirty was the concrete and what type of stains were there? If it was concrete that was really dirty I wouldn't go below 3000 psi or it may require multiple passes with the surface cleaner
 
If you want to clean at a good pace I would suggest 8/10 gpm @ 3000 psi trust me it's worth the extra money for fuel.
 
The Cleaner said:
If you want to clean at a good pace I would suggest 8/10 gpm @ 3000 psi trust me it's worth the extra money for fuel.
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:thumbup: Love my 8 gpm.
 
8gpm is the new 5gpm
i love mine,just wanna switch to 1/2" hose
 
My guess is that there are places where the psi won't make that much difference, and there are places where it will, but its better to be over powered and just roll through everything. This seems to show that it's the gpm's that make the most difference, as per Nigels impact formula. I think the gun can leave more 'clean marks' with less psi in the surface cleaner.
 
1/2 inch hose on the reel 1/2 inch hose( no gun) on the surface cleaners 8/10 gpm @ 3000/3200 psi HOT WATER now your cleaning !! We have run this way for years now and it works real well.

GPM for moving alot of sand and debri is a must when you have lots of sq ft to clean!!
 
Eliminating the gun on the surface cleaner made a pretty big difference for me.
 
I know more gpm is better.

The place I tested just had a lot of tire marks.

I'll try testing in a foot traffic area and see what happens.

If 1500 psi is all that's needed then I can do dual purpose with my setup and do sidewalks AND coils with the same rig.
 
Ron Musgraves said:
I ran 2000 psi when I first started, places got just as clean. 11hp hondas

No surface cleaners, no one had invented them.
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Maybe they got clean, but how long did it take them to do it? I thought we were talking about cleaning in this century...:sarcastic:
 
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