berry stains on concrete

i have a nice sized job to do around a pool it looks like a bunch of berry stains all over the concrete, they are black in color now, i have a 3000 psi hot water machine it doesent seem to be taking them off they probally been there for a while, what kind of chemicals should i try?? thanks
 
Berry Stains

We are definitely neighbors.about 15 minutes apart. I'm not trying to belittle but are you sure they are berries? At this time of year there are many types of oaks in this area that will leave those stains from the acorns , nuts or what have you. The key is in telling the customer that they need to remove that tree or be proactive when they drop, the same for a berry tree. This happened to me about 5 years ago and it dumbfounded me. I got a tree specialist and made test spots with the different acorns and found that certain types leave stains that look like berry stains.Either way I would also "start" with oxalic acid also.
 

John Orr

Member
I encounter these "natural" stains on a regular basis and have always been able to remove them completely with bleach. I usually use a 1:10 mixture (downstreaming is fine and fast), but occaisionally I have used it straight. Spray it on and let it dwell for a while, then reapply until gone.

I don't know if the oxalic acid would work, but then the entire area would need to be treated so that it will blend-in. (Since the acid will brighten the concrete.) Since this is around a pool, using bleach should not be a problem.
 

WFSTOTT

New member
BERRY STAINS?

I ALSO WOULD TEND TO BELIEVE THAT THESE STAINS MIGHT BE FROM ACORNS OR SOMETHING OF THAT SORT. I ENCOUNTERED THE SAME BLACK LOOKING STAINS WHICH WERE FROM ACORNS. I JUST USED MY NORMAL DOWNSTREAM CHLORINE (10%) & USED THE SURFACE CLEANER. I THEN SPRAYED STRAIGHT 10% (LOW PRESSURE) CHLORINE ON IT. IT DID A GREAT JOB REMOVING THE STAINS.
 
I use a X-Jet with close range nozzle. A Sureflo pump would be my second choice. When using the X-Jet double the mixture to allow for dilution.
 
I agree with John, I use bleach diluted 1 gallon bleach to 4 gallons water then downstream and soak the entire area. The stains will dissappear as the solution works. It may take 2 applications and washing the concrete may be necessary to remove dirt and mold but the stains will go away with bleach.
 

henrysaiman321

New member
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