2500 PSI on concrete?

tigerwash said:
I am looking upgrading to a 5.6 GPM 2500 psi machine. My only concern is the PSI. Is 2500 enough to effectively clean concrete?
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It's a perfect machine for residential concrete, commercial is a different story. I use mine on driveways almost everyday.
 

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I started with a 4200 psi/ 4 gpm machine and had to use larger sized nozzles to bring the psi to 2200-2500 psi because I was stripping the creme off of concrete (residential) Then I went to 5 gpm 3000. Still had to use bigger nozzles, then 4.6 gpm/3000psi. Now I am using a 5.5 gpm 2500 psi machine. I use the correct sized nozzles for the machine, with a Classic and it works better then any of the configurations I have used. That's my experience with the machine you are asking about. Also, yes pretreating helps immensely. I wouldn't even try to clean a driveway without soaping it up first. The longer the dwell time the easier the cleaning. Oh and I have 200 feet of hose one my reel and I use a super suds sucker. The psi at the gun is 2300- 2400 psi.
 
5.6 for sure, the volume will make more difference than the psi. Whats holding it back to 2500?
 
I am with Ralph let them chemicals do the work those pics are great by the way.Great job on the concrete cleaning pictures.
 
AZ PowerWash Pros said:
If its a $1000 difference then buy it. Remove the pump. Buy a TS2021 http://www.pressurewasherauthority....mp-ts2021&cat=general-pump-cw-ad&catstr=HOME:

$454 save $546

Then sell the 2500 psi pump on Cleaning Equipment Trader and you come close to breaking even at 5.5 3500
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+1 At only 2500 psi, there would way too many driveways that I would be very disappointed in the result or unhappy about how slow it takes to clean it. 4 out of 5 driveways, I am using full power of 5.6 gpm @ 3,500 psi.
 
Love my 10gpm
 
I know a guy around here (He is actually on PWI sometimes) who bought a 5.5 GPM 3500 PSI for residential cleaning, and ended up putting 2500 PSI nozzles in his surface cleaner anyway. 3500 PSI is too much for residential concrete. I am getting by just fine with 7 GPM and about 2000 PSI. Go with the 2500 PSI machine IF you are only doing residential. It will save you not only that initial investment, but probably a couple grand worth of gas per year.

I have posted this pic many places to prove this point, but I guess I'll keep posting it. Here is concrete cleaned with 7 GPM 2000 PSI, and pretreating with bleach and caustic downstreamed.

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JDhomeservices said:
I know a guy around here (He is actually on PWI sometimes) who bought a 5.5 GPM 3500 PSI for residential cleaning, and ended up putting 2500 PSI nozzles in his surface cleaner anyway. 3500 PSI is too much for residential concrete. I am getting by just fine with 7 GPM and about 2000 PSI. Go with the 2500 PSI machine IF you are only doing residential. It will save you not only that initial investment, but probably a couple grand worth of gas per year.

I have posted this pic many places to prove this point, but I guess I'll keep posting it. Here is concrete cleaned with 7 GPM 2000 PSI, and pretreating with bleach and caustic downstreamed.

Sent from my DROID RAZR using Tapatalk
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Exactly Josh. 3500 psi on driveways by me would require a 5 gallon bucket to carry away the top layer of concrete that ends up in the gutter. David mentioned commercial flatwork. That would probably require more psi.
 
Ralph Q said:
Exactly Josh. 3500 psi on driveways by me would require a 5 gallon bucket to carry away the top layer of concrete that ends up in the gutter. David mentioned commercial flatwork. That would probably require more psi.
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Yeah, it would require more pressure for commercial most likely., but if that's the case, he probably be better off holding out for a hot water skid. At least that's what I'm doing. Using my hi volume low pressure machine for residential cleaning until I can afford that 10 GPM Water Dragon I really want. But hey, I'm in a really competitive market here. I only get about 10 cents per square foot for a house wash. A lot of guys on this board would not be profitable if they washed a 1500 square foot house for $150. But if I can knock it out in an hour and use less than a gallon of gas on the machine, it works for me.

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JDhomeservices said:
I know a guy around here (He is actually on PWI sometimes) who bought a 5.5 GPM 3500 PSI for residential cleaning, and ended up putting 2500 PSI nozzles in his surface cleaner anyway. 3500 PSI is too much for residential concrete. I am getting by just fine with 7 GPM and about 2000 PSI. Go with the 2500 PSI machine IF you are only doing residential. It will save you not only that initial investment, but probably a couple grand worth of gas per year.

I have posted this pic many places to prove this point, but I guess I'll keep posting it. Here is concrete cleaned with 7 GPM 2000 PSI, and pretreating with bleach and caustic downstreamed.

Sent from my DROID RAZR using Tapatalk
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Looks great Josh. Do you recommend always pretreating when using this low of a PSI? Personally i never pretreat concrete put it might prove necessary now.

So I guess the overall consensus is go for the 5.6 GPM which will definitely be enough for res concrete cleaning?
 
tigerwash said:
Looks great Josh. Do you recommend always pretreating when using this low of a PSI? Personally i never pretreat concrete put it might prove necessary now.

So I guess the overall consensus is go for the 5.6 GPM which will definitely be enough for res concrete cleaning?
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It will definitely be enough for residential. You may need at least a light pretreat though.

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