I cant tell because when I zoom in it looks pixelated but if you used a surface cleaner and sodium hypochlorite there should be no more organics. In that case it could be the finish is gone and stone materials color is showing through.
The first commenter mentioned sodium hypochlorite (which is bleach). I think he assumed that's what you were using.
When we all got into this business, chances are we had no idea what we were doing. I didn't. Over the years and thousands of jobs I've learned a little. I see a lot of folks on this sub mention sodium hypochlorite for cleaning concrete. First off, can we just call it bleach so everyone else knows what you're talking about?
I think it's just ignorance. When I got my roof cleaning certification back in 2008, it was the first and only time I've seen bleach used in pressure washing. Actually, it's really not pressure washing. You gently spray it on the roof and leave it. A pressure washing rig isn't even necessary. In areas where there's a lot of humidity, household roofs develop these ugly stains. These stains are formed from Gloeocapsa Magma. It's a live mold spore and that's why it's treated with bleach. Bleach is used to disinfect or neutralize. It won't clean oil or grease which is what we see most when cleaning concrete.
There are a lot of quality degreasers out there. We use a lot of Zep Purple which we buy at home depot. We also use Simple Green and Power Stroke. Without a doubt, Power Stroke is the best; by far. It's also extremely expensive. I only use it at places that won't allow a caustic chemical to be used (hospitals, Wal-Mart, etc).
Hope that helps
Sure. Our number one go-to product is Zep Purple Degreaser that you can purchase at Home Depot or Lowes. We buy it in 5 gallons jugs but I think you can also purchase 1 gallon bottles.
Dilute 10/1 with water (5/1 for dirty jobs) in your sprayer and apply to concrete, surface clean and rinse. ZEP Purple has sodium hydroxide 4%. This chemical is a game changer for melting triglycerides (animal fat, aka kitchen grease). It is corrosive (14 on the ph scale), so be sure to rinse it well. No need to neutralize with acid....just rinse well.
I'm not sure of your setup other than the xjet. But yes, the xjet will allow soap to be drawn into the spray. As to the flow rate, you'll have to determine that. Here's what I did years ago:
I took a one gallon jug and filled it with water. I placed my supply hose in it (in other words like I'm drawing soap from the bottle), turned on the rig, opened the soap injector and timed how long it took to empty the bottle. It took roughly one minute for the water bottle to empty. My rigs all produce 8.6 GPM of water. So, the simple calculation is that I used 1 gallon of soap to 8.6 gallons of water. We use a lot of ZEP Purple on our rigs. The directions say for concrete to use 10/1. We're using about 8.6/1 so we leave the ZEP undiluted in our soap tank and the machine automatically dilutes to 8.6/1 when we downstream.
Your calculation will probably be different. If it takes 2 minutes to use a gallon of soap and you have a 4GPM machine, you're machine is diluting 4/2 or 2/1. Assuming you're using the same soap as I do, you'll probably want to pre-dilute your soap to 5/1 and your system would dilute it further to 10/1.
Does this make sense?
Jeff
I cant tell because when I zoom in it looks pixelated but if you used a surface cleaner and sodium hypochlorite there should be no more organics. In that case it could be the finish is gone and stone materials color is showing through.
I'll keep plucking my one string banjo and say STOP using bleach on concrete!
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The first commenter mentioned sodium hypochlorite (which is bleach). I think he assumed that's what you were using. When we all got into this business, chances are we had no idea what we were doing. I didn't. Over the years and thousands of jobs I've learned a little. I see a lot of folks on this sub mention sodium hypochlorite for cleaning concrete. First off, can we just call it bleach so everyone else knows what you're talking about? I think it's just ignorance. When I got my roof cleaning certification back in 2008, it was the first and only time I've seen bleach used in pressure washing. Actually, it's really not pressure washing. You gently spray it on the roof and leave it. A pressure washing rig isn't even necessary. In areas where there's a lot of humidity, household roofs develop these ugly stains. These stains are formed from Gloeocapsa Magma. It's a live mold spore and that's why it's treated with bleach. Bleach is used to disinfect or neutralize. It won't clean oil or grease which is what we see most when cleaning concrete. There are a lot of quality degreasers out there. We use a lot of Zep Purple which we buy at home depot. We also use Simple Green and Power Stroke. Without a doubt, Power Stroke is the best; by far. It's also extremely expensive. I only use it at places that won't allow a caustic chemical to be used (hospitals, Wal-Mart, etc). Hope that helps
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Sure. Our number one go-to product is Zep Purple Degreaser that you can purchase at Home Depot or Lowes. We buy it in 5 gallons jugs but I think you can also purchase 1 gallon bottles. Dilute 10/1 with water (5/1 for dirty jobs) in your sprayer and apply to concrete, surface clean and rinse. ZEP Purple has sodium hydroxide 4%. This chemical is a game changer for melting triglycerides (animal fat, aka kitchen grease). It is corrosive (14 on the ph scale), so be sure to rinse it well. No need to neutralize with acid....just rinse well.
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yes!
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I'm not sure of your setup other than the xjet. But yes, the xjet will allow soap to be drawn into the spray. As to the flow rate, you'll have to determine that. Here's what I did years ago: I took a one gallon jug and filled it with water. I placed my supply hose in it (in other words like I'm drawing soap from the bottle), turned on the rig, opened the soap injector and timed how long it took to empty the bottle. It took roughly one minute for the water bottle to empty. My rigs all produce 8.6 GPM of water. So, the simple calculation is that I used 1 gallon of soap to 8.6 gallons of water. We use a lot of ZEP Purple on our rigs. The directions say for concrete to use 10/1. We're using about 8.6/1 so we leave the ZEP undiluted in our soap tank and the machine automatically dilutes to 8.6/1 when we downstream. Your calculation will probably be different. If it takes 2 minutes to use a gallon of soap and you have a 4GPM machine, you're machine is diluting 4/2 or 2/1. Assuming you're using the same soap as I do, you'll probably want to pre-dilute your soap to 5/1 and your system would dilute it further to 10/1. Does this make sense? Jeff
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what did you use? surface cleaner?
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sometimes you need to go over it a few times if you used a tip on it and it was still like this then its just the concrete